diff --git a/web/app/components/workflow/skill/editor/skill-editor/plugins/file-reference-block/component.tsx b/web/app/components/workflow/skill/editor/skill-editor/plugins/file-reference-block/component.tsx
index 12c17724a9..048a7d4027 100644
--- a/web/app/components/workflow/skill/editor/skill-editor/plugins/file-reference-block/component.tsx
+++ b/web/app/components/workflow/skill/editor/skill-editor/plugins/file-reference-block/component.tsx
@@ -2,11 +2,12 @@ import type { LexicalNode } from 'lexical'
 import type { FileAppearanceType } from '@/app/components/base/file-uploader/types'
 import type { TreeNodeData } from '@/app/components/workflow/skill/type'
 import { useLexicalComposerContext } from '@lexical/react/LexicalComposerContext'
-import { RiFolderLine } from '@remixicon/react'
+import { RiAlertFill, RiFolderLine } from '@remixicon/react'
 import { $getNodeByKey } from 'lexical'
 import * as React from 'react'
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import { createPortal } from 'react-dom'
+import { useTranslation } from 'react-i18next'
 import FileTypeIcon from '@/app/components/base/file-uploader/file-type-icon'
 import {
   PortalToFollowElem,
@@ -14,6 +15,7 @@ import {
   PortalToFollowElemTrigger,
 } from '@/app/components/base/portal-to-follow-elem'
 import { useSelectOrDelete } from '@/app/components/base/prompt-editor/hooks'
+import Tooltip from '@/app/components/base/tooltip'
 import { useSkillAssetNodeMap } from '@/app/components/workflow/skill/hooks/use-skill-asset-tree'
 import { getFileIconType } from '@/app/components/workflow/skill/utils/file-utils'
 import { cn } from '@/utils/classnames'
@@ -29,20 +31,42 @@ type FileReferenceBlockProps = {
 const FileReferenceBlock = ({ nodeKey, resourceId }: FileReferenceBlockProps) => {
   const [editor] = useLexicalComposerContext()
   const [ref, isSelected] = useSelectOrDelete(nodeKey)
-  const { data: nodeMap } = useSkillAssetNodeMap()
+  const { data: nodeMap, isLoading: isNodeMapLoading } = useSkillAssetNodeMap()
   const [open, setOpen] = useState(false)
   const [previewOpen, setPreviewOpen] = useState(false)
   const [previewStyle, setPreviewStyle] = useState<React.CSSProperties | null>(null)
   const closeTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
   const { enabled: isPreviewEnabled } = useFilePreviewContext()
+  const { t } = useTranslation()
   const isInteractive = editor.isEditable()
 
   const currentNode = useMemo(() => nodeMap?.get(resourceId), [nodeMap, resourceId])
+
+  const fallbackName = useMemo(() => {
+    if (resourceId.includes('/')) {
+      const segments = resourceId.split('/').filter(Boolean)
+      return segments[segments.length - 1] ?? resourceId.slice(0, 8)
+    }
+    return resourceId.slice(0, 8)
+  }, [resourceId])
   const isFolder = currentNode?.node_type === 'folder'
-  const shouldPreview = isPreviewEnabled && !isFolder
-  const displayName = currentNode?.name ?? resourceId
-  const iconType = !isFolder && currentNode ? getFileIconType(currentNode.name, currentNode.extension) : null
-  const title = currentNode?.path ?? displayName
+  const isMissing = !isNodeMapLoading && !currentNode
+  const shouldPreview = isPreviewEnabled && !isFolder && !isMissing
+  const displayName = currentNode?.name ?? fallbackName
+  const iconType = !isFolder && currentNode
+    ? getFileIconType(currentNode?.name || '', currentNode?.extension)
+    : null
+  const pathForTooltip = (currentNode?.path ?? (resourceId.includes('/') ? resourceId : undefined))?.slice(1) // remove leading slash for better display
+  const tooltipContent = isMissing
+    ? (
+        <div className="space-y-1">
+          <div className="system-xs-medium text-text-secondary">{t('skillEditor.fileNotFound', { ns: 'workflow' })}</div>
+          {pathForTooltip && (
+            <div>{pathForTooltip}</div>
+          )}
+        </div>
+      )
+    : (<div className="system-xs-medium text-text-secondary">{pathForTooltip ?? displayName}</div>)
 
   const handleSelect = useCallback((node: TreeNodeData) => {
     editor.update(() => {
@@ -124,35 +148,42 @@ const FileReferenceBlock = ({ nodeKey, resourceId }: FileReferenceBlockProps) =>
       placement="bottom-start"
       offset={4}
     >
-      <PortalToFollowElemTrigger asChild ref={ref}>
-        <span
-          className={cn(
-            'inline-flex min-w-[18px] select-none items-center gap-[2px] overflow-hidden rounded-[5px] border border-state-accent-hover-alt bg-state-accent-hover py-[1px] pl-[1px] pr-[4px] shadow-xs',
-            isInteractive ? 'cursor-pointer' : 'cursor-default',
-            isSelected && 'border-text-accent',
-          )}
-          title={title}
-          onMouseDown={() => {
-            if (!isInteractive)
-              return
-            setOpen(prev => !prev)
-          }}
-        >
-          <span className="flex items-center justify-center p-px">
-            {isFolder
-              ? <RiFolderLine className="size-[14px] text-text-accent" aria-hidden="true" />
-              : (
-                  <FileTypeIcon
-                    type={(iconType || 'document') as FileAppearanceType}
-                    size="sm"
-                    className="!size-[14px]"
-                  />
-                )}
+      <PortalToFollowElemTrigger ref={ref} className="inline-flex">
+        <Tooltip popupContent={tooltipContent} disabled={!tooltipContent}>
+          <span
+            className={cn(
+              'inline-flex min-w-[18px] select-none items-center gap-[2px] overflow-hidden rounded-[5px] border py-[1px] pl-[1px] pr-[4px] shadow-xs',
+              isInteractive ? 'cursor-pointer' : 'cursor-default',
+              isMissing ? 'border-state-warning-active bg-state-warning-hover' : 'border-state-accent-hover-alt bg-state-accent-hover',
+              isSelected && 'border-text-accent',
+            )}
+            onMouseDown={() => {
+              if (!isInteractive)
+                return
+              setOpen(prev => !prev)
+            }}
+          >
+            <span className="flex items-center justify-center p-px">
+              {isFolder
+                ? <RiFolderLine className={cn('size-[14px]', isMissing ? 'text-text-warning' : 'text-text-accent')} aria-hidden="true" />
+                : (
+                    <FileTypeIcon
+                      type={(iconType || 'document') as FileAppearanceType}
+                      size="sm"
+                      className={cn('!size-[14px]', isMissing && '!text-text-warning')}
+                    />
+                  )}
+            </span>
+            <span className={cn('max-w-[180px] truncate text-[12px] font-medium leading-4', isMissing ? 'text-text-warning' : 'text-text-accent')}>
+              {displayName}
+            </span>
+            {
+              isMissing && (
+                <RiAlertFill className="size-3 text-text-warning" />
+              )
+            }
           </span>
-          <span className="max-w-[180px] truncate text-[12px] font-medium leading-4 text-text-accent">
-            {displayName}
-          </span>
-        </span>
+        </Tooltip>
       </PortalToFollowElemTrigger>
       <PortalToFollowElemContent className="z-[1000]">
         <FilePickerPanel
diff --git a/web/i18n/en-US/workflow.json b/web/i18n/en-US/workflow.json
index 0c55e44245..1a58eefa66 100644
--- a/web/i18n/en-US/workflow.json
+++ b/web/i18n/en-US/workflow.json
@@ -1111,6 +1111,7 @@
   "skill.startTab.useThisSkill": "Use this Skill",
   "skillEditor.authorizationBadge": "Auth",
   "skillEditor.authorizationRequired": "Authorization required before use.",
+  "skillEditor.fileNotFound": "The file does not exist",
   "skillEditor.openInSkillEditor": "Open in Skill Editor",
   "skillEditor.previewUnavailable": "Preview unavailable",
   "skillEditor.referenceFiles": "Reference files",
diff --git a/web/i18n/zh-Hans/workflow.json b/web/i18n/zh-Hans/workflow.json
index a083cccaef..c869beb305 100644
--- a/web/i18n/zh-Hans/workflow.json
+++ b/web/i18n/zh-Hans/workflow.json
@@ -1103,6 +1103,7 @@
   "skill.startTab.useThisSkill": "使用此 Skill",
   "skillEditor.authorizationBadge": "Auth",
   "skillEditor.authorizationRequired": "使用前需要授权。",
+  "skillEditor.fileNotFound": "文件不存在",
   "skillEditor.openInSkillEditor": "在技能编辑器中打开",
   "skillEditor.previewUnavailable": "无法预览",
   "skillEditor.referenceFiles": "引用文件",