Microsoft Edge browser has a known bug - not sending upload progress during file uploading from the local device. It is known for a year already and hadn't been solved yet: https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/12224510/
So, if you have a big file and use the Microsoft Edge browser, it may look like uploading is stuck on "0%". If, despite, waiting for a while the uploading never completed, we may recommend you to read an article about troubleshooting the file uploading.