Image assets disappeared, and no longer showing as image asset in layers panel

Hello! I’ve recently run into this problem with some images in my project files. Frames that had images in them no longer appear to have them and version history also cannot pull any of the images. They seem to just be gone. We have multiple instances across multiple files where we’ve encountered this. The images now just appear as rectangles in the layers panel. For one project page all of the images have disappeared, while on another only a few.