This is due to website internal logic, DropFromClipboard show images
as raw data:image
because is the simplest implementation to
save the images using IndexedDB, if the website expects an actual image
or not handle raw data, it will ignore the image, sorry for the
incovenience
DropFromClipboard supports any image/png
supported by
the user browser, common formats like PNG, JPG or WEBP works properly,
please read your browser documentation for more information.
In theory, there is not problem and may depend on your device storage (not a problem in any common computer).
Talking about the popup size (if using Browser Extension), the browser will display a scrollbar (native behavior, not programmed by me) when the viewport is considered too big, however, in very small screen this may work wrong.