Hi there! I see you're having trouble with the Calculator# Hide Photos Videos app not importing photos on your iPad. Let's get to the bottom of this so you can securely hide your photos as intended.

To start, could you tell me a bit more about what happens when you try to import photos? For example:
- Are there any error messages showing?
- Does the app open your photo library for selection but then not import?
- Or does it not show your photos at all?
- Also, did you recently update iPadOS or the app itself right before this problem began?

Knowing this can help me guide you better. Meanwhile, I'll provide some general steps to try:

1. Check App Permissions
On your iPad, go to Settings > Privacy > Photos and find Calculator# Hide Photos Videos in the list. Make sure it has permission to access your photos — ideally, set to "All Photos." Without this, the app won't see or import any pictures.

2. Restart the App and iPad
- Close the app fully: double-tap the home button (or swipe up from the bottom on newer iPads) and swipe the app off the screen.
- Restart your iPad by pressing and holding the top button and the volume button until the “slide to power off” appears. After turning it off, turn it back on.
Sometimes this refresh helps apps to reconnect to the photo library properly.

3. Try Importing Photos Again
Open the app and use its import function. When selecting photos, ensure you are tapping "Allow Access to All Photos" if prompted.

4. Check for Updates
Sometimes apps need updates to work smoothly on certain iOS versions. Go to the App Store and check if Calculator# Hide Photos Videos has an update available.

If these steps don’t help, there might be a deeper issue with how the app integrates with iOS 13 (since you mentioned OS X 10.15.7, I assume the iPad might be on a similar timeline). In that case, I'd want to know if any backup of your photos exists elsewhere, to keep your data safe.

Let me know how these work out or if anything unusual happens in the process!