In order to upload files larger than xxx MB you should create a php.ini file recursively in the Moodle directory with the following content:
max_post_size = xxxMB
max_execution_time = 200
post_max_size = xxxMB
This will allow you to upload files as large as xxxMB.
But please note that if the files are too big they might be corrupted of they exceed the HTTP server timeout.
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