both photos and videos are heavily compressed. it's fine to watch on a mobile screen or even a tablet. but they are no longer original. it is fine for keeping a copy for quick viewing and sharing. but do not use it to save originals if originals are important to you.
iirc images are shrunk and optimized to 1600 pixels and videos are converted to 1080p.
iirc images are shrunk and optimized to 1600 pixels and videos are converted to 1080p.