Can not push a 300 MB realm DB file using Android Studio?

I have an Android App, it requires a Realm DB file of 300 MBs, however when I try to Push it onto my GitLab it stops with an error message push was rejected by remote . This happens after 5-10 mins of giving Push command. After this, If I try to push some other file which is of few Bytes only, it also can not be pushed and ends up with the same error message. Although, before pushing the big (300 MB) file everything could be pushed onto GitLab. Any suggestions on what is wrong? Thank you!