@BlueStateBabe Microsoft Access is a better tool for this, but is also more complex. This Microsoft link suggests how to do it; it depends on what version of Excel you have.
@BlueStateBabe Yes, you'd have to create thumbnails of the original, otherwise the file quickly bloats.
@WordsmithFL
That seems fairly simple, but doesn't mention what it does to the resolution. I'm afraid it would be downgraded.