Hello @Eema, I have some ideas for you. But I do also have a question on how you plan to identify the file. Is it the same file each day?
Start with a scheduled cloud flow.
Step 1: Start a loop (Apply to each).
Step 2: Identify the file in some way. (Since you have multiple people, you will need to create a list for them or check a SP group and for each member)
Step 3: Set a condition to check for the file.
Step 3a(If true): Send email if file is not found.
Step 3b(if false): do nothing.
Step 4: Resubmit the flow. (PowerAutomate action).
You may need to set a delay in there, and I would suggest using a couple lists that can store some of the values.