The restriction to JPG and TIFF file formats when printing from a USB stick with the Epson EcoTank ET-16650 is actually a known behaviour of this printer.

### Cause
- The printer primarily supports the file formats JPG and TIFF when printing directly from a USB stick. This is a limitation of the printer's integrated functions.

### Solution
- To print other file formats such as documents (e.g. PDF, Word, Excel) or other image formats, you should print these files via the computer or a mobile device. To do this, use the Epson iPrint app or the Epson Connect services, which support a wider range of file formats.
- Alternatively, you can open the files on your computer or mobile device and then print them using the computer's printing software or the mobile app.

These methods allow you to print a variety of file formats that are not supported directly from the USB stick.