Please check this page for mounting EOOKE screens.

It most probably because the frame doesn't support that photo files.

 in this case please use Photoshop to Save the photo to "Base line" JPEG image, see image below:

It most probably because the frame doesn't support the USB drive you use , please format the USB drive (recommend 32Gb or less) to Fat32 format.

NO, no frame can play in random order. However, all EOOKE digital photo frame have random transit effect, however they do not slide/play in random order, you need use 3rd to randomize the pictures youself each time you need shuffe images.

Please make sure that the photos that you have uploaded onto the memory are in a compatable format that your frame support . Also make sure that the picture is viewable in a computer and there is no issue with the file itself.

If all above are fine, it is probably because it doesn't support that photos ( their files size/resolution are too large or a wrong codec/file format), please use photoshop resize the two images resolution to 1920x1080 and then "save as to" a "baseline (standard)" jpg image (see below 2 pictures):

Yes, for our AD frame and signage dispaly. However it's better to turn it off when is possible because this wastes less electricity good to service life.
Yes you can definitely add more files to you digital photo frame. Simply buy a SD card that will work for your digital frame and insert it into the expanstion slot and you will have increased space into your digital fram

Depending on the type of frame you select. Each frame has its own default set number of memory preinstalled into the unit and also depending on the size of the memory card/usb drive you have. Here is a rough estimate on what a certain size memory can hold.

JPG files are 5 Mb or smaller, so 192 files can be stored on a 1 Gb storage,  you can store over 5,000 photographs on a 32Gb SD memory cards.

Most digi frames will play mp3 files while the pictures are running in the secquence you have selected. Please look at details of listed features before buying for specific request.
Putting pictures into your digital frame is a very simple process and it varies from frame to frame. Don't worry, most frames come with a easy to follow guide on how to add pictures to digital frame.