Unable to upload world to realm

Hello, I created a Minecraft realm yesterday for me and my friends and I have had so many errors. Whenever I try to upload a world to my realm (I'm on Realms Plus), it just gives me an error. I was uploading on the Nintendo Switch. Then later I tried my iPod Touch 2015, and it still gave me errors. But I finally tried it on my phone (Which is still on 1.16.201) and it worked. The service has been appalling and really not the best. I really need it fixed quickly because I only paid for a month and it was quite expensive for me.