Detecting Potentially Malicious Files in Pop Ups I receive

Hi there – I need some help PLEASE! My new cybersecurity suite can’t address this and I need some advice recommendations on websites or apps etc please. My current service blocks any small file or add on to a program or app that is working on my computer. I receive a pop up of the name inside a window so it isn’t something I can scan and I don’t want to accept it just so I can evaluate it. I am hoping there is some service where I can enter in the text name of file, extension, assistant etc. to verify if it is secure or a potential threat. PLEASE and thank you for your help.