[JavaScript Error: "Note 'Х...' too long for item '11377376/3MDY59UJ'" {file: "chrome://zotero/content/xpcom/sync/syncEngine.js" line: 1324}][JavaScript Error: "out of memory"]
Upload image file with the file dialog or by dragging and dropping images onto the dashed region
The next version of Zotero (currently in beta) will officially support images in notes, but for now if you want to sync you'll need to remove them.