Thank you for your reply. I can receive notepad/text files but not any other type of files, and all I get is a notification from the sender that "I tried to send you the file, check your settings and try again - every single time. I've never had this problem until I switched to a new computer but I haven't changed any settings so it's a mystery to me. The files I cannot receive at all are all epub files and it seems to definitely be a problem on my end. I'll check out your suggestions and keep asking around but I'm getting pretty desperate tbh.
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