Learn English – “Download from” vs. “download off”

Yes, technically if could be considered downloading/uploading, but if you use it that way it may get confusing.

Downloading/uploading is generally used when you connect the computer to a distant source, for example a server on internet. If you use it for small devices, it's not as obvious which direction is up or down.

If you for example have a network storage unit in your network, it's not at all clear if it should be considered as a server or a storage device, and uploading would have completely different meaning depending on what definition you choose.

To take (something) out of the picture is an idiom meaning to remove it from consideration. If you are pondering, for example, whether to trade your sandwich, apple, or cookie to your friend in exchange for his candy bar, you might decide that you would get into too much trouble if you traded your sandwich; so you "take the sandwich out of the picture", reducing your choice to either the apple or the cookies. The sandwich is no longer an option.

To "take (X) off (Y)" generally implies that item X is physically resting on top of item Y. So, to "take this part off the picture" would probably mean that you have a picture, and a part is sitting on the picture, blocking your view of something in the picture. So you move it.

To "take (X) from (Y)" generally implies that X is presently a part of Y and you are going to remove it. So, to "take this part from the picture" means that you have a picture of an something, including a particular item. You intend to remove the item, and re-take the picture without the item present.