Hi @72Zib,
Yes, this would be possible by using a Get files action (order it by ID ascending) and count the length of the output. When this equals 31 you could use the identifier of the first item (since it is ordered ascending by ID) and delete that file.
Below is an example of that approach.

1. Add a Get Files (properties only action). Configure it to use your specific folder. Make sure you also use the sort ID asc.

2. Add a condition with the following expression:
length(outputs('Get_files_(properties_only)')?['body/value'])
3. Add a delete file action. Use the following expression to delete the first file.
outputs('Get_files_(properties_only)')?['body/value'][0]['{Identifier}']
