Thunderbroom, your zip should ONLY contain the project file and any additional files necessary. NONE of the original source files should be included. Additional files should be any reverb impulses and JS FX not included in the standard Reaper installation.
Hopefully, you did not need to glue or freeze any tracks/items that would have generated new audio files. And, if for some reason you did need to do so, you should use the FLAC file type for those generated files to reduce the total upload size.
Any of the original SOURCE files should be removed from your zip file.
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