Issue with Iphone and Itunes Syncing and uploading photos?

I was first trying to upload some of my photos & videos by syncing them onto my iPhone 6s, and I've been having issues can anyone help me fix this problem including how to get rid of the error message and able to put my folders with my images on my iPhone?

Error Message: The iPhone _____ could not be synced because the sync session failed to finish

I guess try updating itunes to the latest version and see if iphone 6s is up to date.

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