Unfortunately, your contribution is difficult to read. It would be good if you could work with the formatting options of the editor here so that your answers are easier to read.
All the messages you mentioned, as far as I can see, have nothing to do with your actual problem. I have one more question about this:
Where exactly are you looking for the files? Are you under Media in the backend or are you in the media selection for feature images? Does the problem exist in both places?
Briefly about the messages (as far as I can recognise them):
Page cache is not detected and the server response time is slow
Take a look here: https://www.ads-software.com/documentation/article/optimization/
One or more recommended modules are missing
You should ask your hoster’s support what is displayed here. They should be able to install/activate it.
The “post_max_size” value is smaller than “upload_max_filesize”
You should also report this to your hoster’s support team. The two details are incorrect here.