Begin with the source
A 4K display cannot supply detail absent from the video source. Look at the edition's actual quality options, supported apps and plan requirements. The image on a title page is not a video-resolution badge.
Let a stream settle
An adaptive player may begin at a lower quality before improving. If it repeatedly stalls, try a lower setting and pause other heavy transfers. Choose a stable picture over a setting that constantly interrupts the scene.
Different rooms need different choices
At a normal television viewing distance, judge the whole image rather than inspecting pixels from beside the screen. On mobile data, consider the screen size and your data allowance. Captions and sound remain important at every resolution.
Keep the problem specific
A soft picture, buffering, missing sound and an unsupported-device error have different causes. Read playback help for a next step matched to the symptom.