maximum size attachment on internet via computer not mobile phone?

the max size attachment that is pretty common across all email providers is 25MB.

the file types do not matter. if you are sending multiple files that cannot fit due to the max size capacity, try converting the files into zip.files, zip.files are compressed so they are smaller.

depending on what internet provider you have, the attachment may open in another tab in your current internet session. most of the time, it will ask you to download it or open it up before doing anything on its own.