Requirements: These will be located in the folder you select for uploading elements.
Tap the plus symbol on the upper right in the menu bar.
A context menu will appear at the bottom of the screen.
Tap Pick photos.
The window Images will open, showing all device folders that contain photos or videos.
Choose the photos or videos you want to upload and then tap
Done, to upload them.
The elements will be uploaded in the background. Afterwards, you have the option of moving uploaded elements to other folders.