[JavaScript Error: "Upload request 1/ZCBL3Z77 failed"][JavaScript Error: "Group with libraryID 1 does not exist" {file: "chrome://zotero/content/xpcom/data/groups.js" line: 108}]
Upload image file with the file dialog or by dragging and dropping images onto the dashed region
After doing so, simply restarting Zotero will likely fix this (but please submit the Debug ID first if you can).