Why is Microsoft Onedrive so unreliable?

I mean I could have used icloud which is very reliable but because I use a Windows PC and an iphone it would have been nice if onedirve worked smoothly but there's always something. Sometimes not transferring. Sometimes just stays on "waiting" when uploading and a lot more issues. That is just very annoying. Sometimes one drive icon shows on my taskbar and some other time it disappears. I'm very much computer savvy so it was simple I could have solved it.

IMPORTANT! IMESSAGE AND IPHONE

MY MUM WANTS TO MESSAGE ME THROUGH IMESSAGE, SHE GAVE ME HER EMAIL, if i message her now what will she get of mine? (my phone number or my email?) i know it doesn't make sense but please help as soon as possible!

Fixing black side bars on iPhone video?

I just came back from Europe and I took a ton of video on my iPhone and was going to use it for my travel vlog. However, I refuse to use it if I can't fix the black bars because of the aspect ratio. I know the aspect ratio needs to go from 4:3 to 16:9. I've tried and researched several ideas and nothing is working.

Does anyone know a magic cure?

I can't send pictures with my iPhone?

I can send pictures to other iPhones no problem. I can even send them to my mother, who doesn't have an iPhone. Try sending pics to my brother who also doesn't have an iPhone, I can't even tap on the camera logo. I do but nothing happens.