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fixes: #2242
related_to: #2242
This PR has fixed the issue only for the attachment icon when sending an email, and this fix is specifically designed to show the loading progress and prevent further uploads at that time. I have raised only the partial fix as I have some questions regarding the other uploads.

@RitvikSardana In case of uploading image and video icon in reply/comment, helpdesk relies on TextEditorFixedMenu component of frappe-ui and Insert Image, InsertVideo that comes as part of it. It's not easy to directly handle this case, unlike button component where the upload, progress slots are open. How do you think it could be handled in a better way?