You need to use images that are free for use. I’ll link a thread I made about it here. I have steps on how to find images that are free for use there.
Good advice is to just assume that all images are copyrighted until you determine that they are free for use.
I also recommend using Pixabay. It is a website that has a selection of free to use images there.
If you are using images in someone’s google drive (these contain images provided by our community’s editors), you need to ensure you follow their Terms of Service (which includes the appropriate crediting in the story).