No Instruction Booklet

Question edited for clarity.

This page of the manual. It is for the 1007B, but should be the same

https://www.libble.eu/proline-pl-dpf-1007b/online-manual-582491/?page=15

..

http://www.wikio.co.uk/guide/digital-photo-frahttp://www.newegg.com/Product/ProductList.aspx?Submit=ENE&Manufactory=11920&N=50011920&SpeTabStoreType=0mes-7_inch-review-10413-page1-sort0.html

Question edited for a lot more clarity.
Question moved from Cameras.

Yes, you connect it to a computer

https://www.google.com/search?q=DPF+8+inch+internal+memory

Manual

Manuals for DPF-D820 - Sony Canada

https://www.sony.ca > electronics > support > manuals

Find instruction manuals and brochures for DPF-D820. ... [PDF] SD Memory Card Compatibility Information for Digital Photo Frames and Printers(150.5 ...

..

Maybe this manual will help you:
https://www.manualslib.com/manual/1846846/Proline-Pl-Dpf-804b.html?page=2#manual

did you also empty the trash? (until then its not really deleted)

The manual is available HERE. Select Digital Photo Frames and then select your model.

the link for the user manual proline dpf-702

http://www.westinghousedigital.com/pdf/106_User_Manual.pdf

link is tested

greetings

cis

You need to download them onto the frame

The Manual is now at: http://legacywd.com/pdf/106_User_Manual.pdf

Solution:

1. I don't think the USB Cable was given to Download Photos from the computer - I think it was given to upload photos to the Computer.

2. The manufacturer has either gave you the wrong cable for a different type of Operating system or you are trying to put it in the wrong port.

Suggestion:

1. Call a Technical Support Line (Probably found on back of instruction booklet.)

or

2. Send the Product back to the company.