Documents to be uploaded through GOS - Store business document option

We have to upload the documents in various transactions through GOS - Store business document option which will get stored on DMS server.
And for the same we need your guidance on below mentioned points-
1. How to set DMS attachment size limit to for 5 MB; so that file size above 5MB should not get uploaded and system will show an error
2. File size should get compress while uploading through GO

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