When I attach a file to be sent in an email is the progress bar that displays
the file being encoding to MIME
is the file being upload to a server?
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generally mimetypes are part of the file header gmail does flag certain mimetypes and i believe it checks the initial mimetype before uploading then uploads it to the server then searches the file file for other mimetypes eg archives get searched for executable files and for source files
so the loading bar is generally it being uploaded to the server