Limit characters in the key paste textarea field
At the moment the textarea field to paste the key is not limited.
However, on a server side it is much more efficient to get bigger keys uploaded as a file, because these get streamed to disk and do not need to be parsed as a param. So I would suggest to limit the textarea to a certain amount of characters after which users whould rather upload the key as an attachment.
Question is how small or big this limit should be? I would suggest 128kb.