The app can't add a password-protected PDF file to the vault.

Disable password protection of the PDF file and try again.

The PDF file is too large.

You can only add files up to 20 MB to the vault.

Reduce the size of the PDF file and try again.

The image format is unsupported.

Convert the image to a JPEG, PNG, or BMP file and try again.

Your vault contains an image with the same name.

Make sure you haven't added this image to your vault yet.

Rename the image and try again.

The image is too large.

Reduce the size of the image and try again.

The app does not display PDF files located on an SD card.

Move the PDF files from the SD card to your device and try again.