Step 1:  Touch the plus icon in the top-right corner.

Step 2:  From the menu that opens up, touch the “Upload from Media Library” option to upload a picture.
You can also use this menu to upload music files and new pictures/videos with your device’s camera.

Step 3:  From your media library, touch the picture(s) you want to upload. The selected picture(s) will have a green check mark on them. When you have selected all the pictures you want to upload, touch the “Upload” button.

The files will be uploaded into AXEL.