Hi there fwul1,
You've taken some great steps by making sure that setting was on, along with deleting and reinstalling the app.
To clarify, the "Save Original Photos" option is in the Instagram app, correct? We want to ensure we fully understand, so that we can do our best to help. If that is right, you can also see if restarting your iPhone may help, as it can refresh the iOS and apps installed on it. Below will walk you through that, if needed:
"How to restart your iPhone X, 11, 12, 13, or later
- Press and hold either volume button and the side button until the power-off slider appears.
- Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
- To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo."
Those steps can be seen here: Restart your iPhone - Apple Support
If the issue keeps happening after that, you may need to work with the app developer for further assistance with their app, which you can see how to do that with the steps below:
"Contact the developer of an iOS, iPadOS, or watchOS app
- Open the App Store on your iPhone or iPad.
- Search for the app, then tap it. If you can't find it, tap the account button
or your photo at the top of the screen, tap Purchased, tap "Not on this [device]," then tap the app. - The app's product page appears. Scroll to the Ratings & Reviews section, then tap App Support. If you don't see App Support, make sure that you're signed in with the correct Apple ID."
You can view those steps and more in the following article: How to contact an app developer - Apple Support We hope those steps help.
Take care.