A couple a years ago I created an app in two versions one for old androids and one for android 7 and above.
When I bought a android 13 phone I found to my surprise the app for old androids worked OK but not the app for android 7, where some images were not visible and clicking on links inte the app gave error NET::ERR_CLEARTEXT_NOT_PERMITTED.
I found out that from android 8 or 9 its demanded that links should be https:// and not http://. First I tried to rebuild the app, but it was impossible because of dependency errors in npm.
Instead I found out that it is possible to edit the apk file with the app APK Explorer. Its excellent and free. Then install it.
Then install the app that shall be edited. I had to poke around the app two hours before I figured out how it worked.
Open the app in APK Explorer by clicking on installed apps for users. There you will find your app.and clicking on it you will see folder and files inside the app.
Click on AndroidManifest.xml. In this file last under <application add this line:android:usesCleartextTraffic="true" The click on save in the upper right corner. Big files like app.js with 1 MB size, was not possible to edit.
Go back to previous page to the right is a hammer that builds a new apk file.
Then uninstall the app thats shall be fixed. Now the edited app shall be installed. Go to first page of the program and click on APKs. You will find your apk under Exported APKs click on it and install.
After that you can check if the app now can access links and view images. It did for me. To transfer the apk to your PC, First move the apk package to Downloads in the phone, Couple USB-cable to the PC and tthen you can copy the apkfile from Downloads in the phone to your PC.