File manager for accessing nas files on android

What is a decent file manager to use for accessing files on my nas from mobile devices. I am using several older galaxy s6 and s7 phones and several tablets. I would prefer freeware however if price tag isnt too steep I would consider purchasing.

I have always used this but I have been using it for so long I have no idea what other apps are out there.

I just installed it to test on one of my devices. Is working well thanks for the tip.

I have used X-Plorer too. Recently discovered Network Browser and it’s quite neat for NAS.

I’ve always used file manager +.