How to re-link files which have paths that have become invalid (can't be found)? I have a Blender project with planes with image textures on them, but the images aren't being loaded. I'm pretty sure I have the images as well, but the person who uploaded all this apparently didn't keep the original folder structure. Where can I see (or edit) the file location for the images?

Note that I'm a new user.
To re-link missing files, open file menu, then choose External Data -> Find Missing Files, and select the folder where the image textures are located. File names have to be the same as they are in the blend file.

The files are found based on matching names, the folder is searched recursively, so you can for example point it at the base of your project path, to perform a more extensive search.