Steps to reproduce the issue

In /administrator/index.php?option=com_media upload file(s) larger than allowed limit

Expected result

Error message: Uploaded file(s) are larger than allowed limit.

Actual result

Error message: You have tried to upload file(s) that are not safe.

System information (as much as possible)

Server

Docker image php:7.3-apache

Client:

• Ubuntu, Chromium 79.0.3945.130
  or
• MacOS, Safari

Additional comments

#15466 was based on incorrect assumption, that JInputFiles get() returns null only if unsafe file was uploaded. But it is also null if upload_max_filesize is less than uploaded file(s) (at least in my environment).

In the controller, there are some checks if the file is too large to upload, but they are called too late in the process.
administrator/components/com_media/controllers/file.php