Define image block size and block the possibility of other users to resize it
Be able to define the size of content blocks (images, in this case) and then to block the possibility for users to change the size of that block, no matter what image they upload there
Laura Carr Cole commented
This is SO needed. Even if it was an error that the size upload has exceeded the size limits. Could also offer the option like in Hubspot and Wordpress where you can resize right there in the upload process.