Dynamic Creative ads are great for testing. If you aren't sure what message might resonate with your audience, and you want to try several images and text combinations, this is a great option.
You can enter up to 5 different versions of headlines and texts, pared with up to 10 videos or images.
The texts and creatives will be mixed and matched to find the best performing combination.
Make sure each text can potentially be shown next to each image. If you need specific texts to go with specific images you will need to build your ads one by one, and not Dynamically.
You are able to see which combinations perform best by clicking on the Ad Set, and clicking on the three small dots to the right of the Dynamic Ad. Choose to view the Dynamic ad combinations by Image, Text, Headline or Description.
Here is another support article with additional information about how to interpret the results data of your Dynamic Creative Ads.