We just observed a strange effect when trying to paste multiple different images from the Windows Fotos app into the WYSIWYG editor:
At first, everything looks ok in WYSIWYG view, but after saving, everywhere an image was inserted, the same, single image is shown multiple times.
The attachments list only contains a single attachment called
grafik.png which contains the image shown at all locations.
This has to be related to the Fotos app - possibly it somehow forces the attachment name to grafik.png, I guess, and thus somehow forcing the previously pasted image to be overwritten - but it’s still the question if this behaviour is “correct” or if Xwiki could provide a workaround here.
Pasting from other sources, e.g. copying the image from the Explorer file list view directly, works and adds an attachment with a generated unique name.