Bloom Reader - Ability to move books to SD-card

Bloom Reader has been part of a research study in PNG for the last two years. They found out that only a small percentage of the teachers had the app and the books installed on their phone. The reason was always lack of space (internal memory).
Bloom Reader has the ability to read books from SD-cards and it’s working great. The problem is that most people don’t have the know-how to move files from their phone-memory to the SD-card.

I have apps on my phone with this feature, and I use it all the time.
Would it be possible to add this feature to Bloom Reader?

Many thanks on behalf of the Education for Life team in PNG.