You pushed PDF Creator for quick JPG to PDF. You weighed privacy vs Drive, CamScanner, Adobe Scan, Office Lens. You noted Samsung Gallery makes PDFs.
Simpler path, no app. Use Android Print to PDF:
- Open Photos or Gallery.
- Select images in order.
- Tap Share, choose Print.
- Change printer to Save as PDF.
- Set size or orientation.
- Tap Save, name teh file.
Works offline on Android 8+ on most phones. Fast, no logins. Good for work receipts or forms.