Bug #76456 InnoDB may upgrade utf8->utf8mb4 without table rebuild in some cases
Submitted: 23 Mar 2015 12:09
Reporter: Andrii Nikitin Email Updates:
Status: Verified Impact on me:
None 
Category:MySQL Server: InnoDB storage engine Severity:S4 (Feature request)
Version: OS:Any
Assigned to: CPU Architecture:Any
Tags: utf8mb4

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: