How to combine multiple images into one PDF file

1. Open Google Play (link) or App Store (link) and install photo2pdf converter
2. Click the Gallery button
3. Select one or more images
4. Click the "DONE" button - this will start the PDF creation process. After creating the document, a form for sharing a PDF file will immediately open.

By the way, you can change the paper orientation by clicking the sheet icon to the left of the main button.