Can you turn this off from the app or do you have to unplug it?

The App is only used for input or edit the text displayed and once the text has sent to the unit it will be stored for displaying when power up without the App . The screen will turn off when disconnected from power source .

Does the app for this support uploading pictures? I’ve noticed some of these do and some don’t.

No you can not upload pictures. It has a bunch of static and animated pictures. You can upload text to sign. Pretty small sign but I use it mainly for home office, for zoom meetings and recording to let others know not to disturb me.

Is there a list of images that can be programmed ? Is there a list of all the pre-installed phrases and languages ?

No list but there are a lot of programmed graphics, the phrases none but you type in tge phrases you want and color of each letter, languages you can use Google translate to change the language or whatever language your using on your phone.

Mounting Type	Wall Mount
Product Dimensions	15"L x 4"W
Shape	Rectangular
Item Weight	0.47 Kilograms
Light Type	LED
Style	Modern
Pre-printed	Letter
Item Thickness	0.33 Centimeters
Included Components	USB cable, 3M tape
UPC	700410059000
Manufacturer	HOIOS
Item Weight	1.04 pounds
Item model number	0001
Material Type	Silicone
Size	15x4"
Manufacturer Part Number	0001

Programmable LED Sign High Bright Scrolling Signs USB 5V LED Matrix Panel Smart APP Control DIY Text Patterns Digital Sign for Car Window 15x4"

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