Almost all mail services have an attachment size limit of about 20 MB. Therefore, it is impossible to send or save large files to yourself.
I suggest that when sending large files, divide them into several letters, so you can send a file of any size! In the settings of the mail account, add the option:
“Send multiple emails to files larger than 20 MB”.
There is a webxdc (mini-app) that can do this: the one named “Sharer”, you can find it in the store. There is also the “FileSync” webxdc which uses Realtime. Each one has its own advantages and disadvantages compared to the other, you should choose depending on your usecase.
It’s a real pain. It’s so slow. I just want to send a video larger than 20 MB so that my contact can easily view it in a chat.
I believe that the ability to send files via messenger should be a built-in feature (without the need for plugins). At the same time, it would be possible to implement “multi-stream” sending and overcome the limitations of mail servers. That would be great!