Uploading to workshop - Compressing.. [265.7 MB] => Failed!

I’m trying to upload an addon to the workshop. It was too big so I split it into 3 parts. However I can’t upload it, it says Compressing… [265.7 MB] => Failed!. I have heard size limit is 300mb so I have no idea why that wouldn’t work.
What am I doing wrong?
(Also did I post this in the wrong place?)

It usually gives you an error message, you should post it too if you want help

All I got was:Garry’s Workshop Publisher 1.1
[Compiled Feb 20 2017 - 20:58:07]
Setting breakpad minidump AppID = 4000
Steam_SetMinidumpSteamID: Caching Steam ID: 76561198051039079 [API loaded no]
Storage Quota: 1.0 GB total, 1023.9 MB free
Opening C:\Users\dino\Documents\Editing\MafAddons\pn_mafrp_1.gma
Compressing… [265.7 MB] => Failed!
I think it’s because its too big, but I thought the limit was 300mb

It’s around 200MB.

Its 200mb compressed, he is failing the compression stage, either he runs out of RAM or the .exe hits its RAM usage limit.

Nope, but it probably was in the past.