D2035292251
Unexpected status code 403 for GET https://api.zotero.org/users/4266488/items/YFK7CGZT/file
Upload image file with the file dialog or by dragging and dropping images onto the dashed region
After that, restarting Zotero will probably fix it.
If you unlink your account in the Sync pane of the preferences and set it up again, this should go away.