I've reviewed the thread here Attachment upload field in Forms - Page 5 - Microsoft Tech Community, and would like to express my frustration at this. I see this was raised sometime in 2019 and to date, you cannot allow the upload of files/attachments for ALL users. This is far restricted to organizational users! Not good at all.
Microsoft needs to give some timeline on how soon they expect anonymous users to be able to upload files via Microsoft Forms. Will appreciate any communication from Microsoft about this.
