Unable to upload a video to SharePoint list

Paul de Jong 

Thanks for your advice!

I have customized my list format via “Customize Forms” under Power Apps, at the same time I created a Power App of this list for our users. Yesterday I doubted this problem might be caused by the different parameters setting between Customize Forms and Apps, so I   made lots of testings and set all attachment parameters the same, unfortunately it still failed in the end.

This morning I tried to upload videos, sometimes it worked but most of times it didn't work. For example:

1. For an existing item of the existing list, the 1st video uploading succeeded, but the following trials failed;
2. For a new item of the existing list, the 1st uploading failed, second one succeeded, but the following ones failed again;
3. Then I tried more than 20 times, it seemed that only 2 times succeeded, both for the MP4 videos and MOV videos, which means all formats of video have the similar problem;
4. I created a list, there's no any problems for uploading videos.

I think the problem only happens in my existing list, it seems that the video uploading function is unstable in our site or our existing list, but I don't know what its cause is and how to fix it. It seems that my only option is that creating a new list to replace this old one which has more than 50 columns and a linkage with a Power Apps and an Automate Flow, it would be a huge trouble for me!!!

 Do you know any other method to find out this problem cause? Thanks!