Upload world to my Realm

Good day and thank you for taking time reading this...

I tried as many as could to just upload my survival world on my Realm , and my world is only 5mb , I was thinking that I have problems in my connection but sadly no, Each time I tried to Upload a world on my Realm, I faced the same problem, after The Exporting end and everything is fine, an Note Pop up says : An Error occurred, I shutdown my game many time and my internet, but the same problem happen, I take about to 12/24 hours only trying to do this upload and in the end I got the same annoying Note Pop : An Error occurred.