How can I reduce passport page photos to under 3 MB for submission?

The user is seeking advice on how to provide scanned passport pages while keeping the file size under the 3 MB limit. They mention that their initial scans and photos result in very large file sizes even after compression. Suggestions from the community include lowering camera resolution, using various apps for photo and PDF compression, combining multiple pages into one, and utilizing specific online tools like ilovepdf.com.