Hi @Lefty ,
Here is a flow I that can do this but you'll need to modify a few things:
1. The trigger- make it 'when an item is created.

Excuse the overlap of actions (Ignore the apply to each above and continue with apply to each below):


You need to change the 'file name' in the 'add attachment' action to your criteria.
You can hard code this part: 'SectionA'- (without the quote marks)
then add an expression like this (modify with your time zone and date formatting).
convertFromUtc(UtcNow(), 'South Africa Standard Time', 'dd/M/yyyy H:mm tt')
and then the 'displayname' dynamic property from the 'get attachment content' action where you choose the dynamic fields from.
So it should look like this when put together:
SectionA-Expression-displayname.
The variable is to add consequtive numbers in case you have the same file names. You can drop this part if not relevant for you.
Please let me know if this helps you.
Regards,
Daniel