[JavaScript Error: "Upload request 1/ZXUNWHCX 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 you've provided that, just restarting Zotero might fix it. But please provide the Debug ID first.