Bug #60394 mysql client tool's '-m' option seems to be depricated.
Submitted: 8 Mar 2011 17:20
Reporter: Meiji KIMURA Email Updates:
Status: Verified Impact on me:
None 
Category:MySQL Server: Command-line Clients Severity:S3 (Non-critical)
Version:5.5.35, 5.6.15, 5.7.34, 5.6.51 OS:Any
Assigned to: CPU Architecture:Any

File: Maximum allowed size is 50MB.
Description:
Privacy:

If the data you need to attach is more than 50MB, you should create a compressed archive of the data, split it to 50MB chunks, and upload each of them as a separate attachment.

To split a large file: