Photos would help. As would some indication of where on the planet you are growing this vine. How much sun does it get?

Basic Pruning Info for Grape Vines

I uploaded a picture. Not sure why it's not showing. Also, I'm not sure how a photo would indicate the following info but here goes. I'm in southern California, Inland Empire area, the vine is in my patio and it gets approximately 3 hours direct sunlight (not my fault, it was planted by someone who didn't know it needed 6+ hours). I'll try to upload another picture.

With only 3 hours of sunlight, it will never flower and produce fruit!! If you want to harvest grapes, you will need to move it to a much sunnier location........6 hours would be an absolute minimum - you want at least 8 and more is better :-))

ETA: a photo is necessary for any pruning info. The other information helps us to give location-pertinent advice....it will not necessarily be the same everywhere!

We've had the plant since 2014. It produced lots of vines and lleaves that year through 2016. In 2017 it produced lots of grape clusters. The following year, nothing but vines and large, green leaves again. Unfortunately, the way our patio is situated no matter where it's planted it will not get more than 3 hours of direct sunlight.

Concerning the photo, I keep uploading them but for some reason, apparently they're not showing. Not sure what to do about that. I'll upload again.

Were you able to see the latest pics I uploaded yesterday?

I see no photos associated with this thread........

Strange. There seems to be a pproblem with Houzz uploading capabilities. I've uploaded pics before. I'll have to contact them. I'll try one last time on this thread.

I've waited but still the pictures aren't uploading.

To all those helping me with my issue uploading pics, I would like to apologize. Evidently, I did not wait long enough for the pics to upload.

Now that that's out of the way, does anyone have any idea on how to properly prune/cultivate this grape vine? As mentioned in the initial comment, the plant is approximately 6+ years old. In 2017 it produced a lot of grape clusters. Since then, only long vines and large, green leaves.

Here's sort of a close up. If you look closely you will notice the two main branches which then have two other branches growing from them. Should I prune those or cut off one of the main branches?

Anyone have any ideas on how I should prune this grape plant?

Did you read the instruction on the link?

Didn't notice the link at first. Thanks. I'll take a look at it.

check the pruning instructions on this link.