First of all, right now, you cannot upload videos from iPads due to a documented iOS issue between the communication of the gallery and the browser on iOS devices. We suggest to use another device as a workaround, you can go directly to www.edpuzzle.com from your laptop or desktop computer and upload videos from there!
If you are currently having troubles with the browser, then the internet connection, temporary server issues, the size or the format of the video can be the origin of the problem.
Also, note that videos cannot exceed 1GB.
If you comply with these requirements and still doesn't work, feel free to contact us with the original file of the video and we will have a look into it. If the video is too large to be attached, please send us a Dropbox or Google Drive link.