Pictalio is a place where you can upload and download stories (which are videos in portrait mode), you can find many story topics!
Yes you can, it's completely free.
Yes, the Pictalio license allows you to use the stories for both personal and commercial purpose.
Check our Terms of Service for detailed explanation of what you can do.
Yes you can, as long as you don't re-upload your modified version as your own creation, the video will always belong to its original creator, but you can use your modified version where you need it.
You can upload videos in portrait mode that you own and have all authorizations on, check our Terms of Service for more details.