Please from the link in the app.
【How to use】
1. Tap the button of the format you want to convert.
2. After moving to the album screen, tap and select the image you want to convert. (Up to 20 sheets)
3. Tap "Select" at the top right of the screen to convert.
4. The converted images will be saved in the automatically created albums "JPG_DATA", "HEIC_DATA" and "PNG_DATA" respectively.
For inquiries, please contact the review section or this DM.
https://twitter.com/corasck