Is it possibile to put up a PLEX server on the steam with files stored on an external disc and using Apple TV/ plex app on it to play remotely?

Can you set the steam deck as a plex server, with files stored on an external disk?

So you mean something like this: https://www.itgigant.nl/refurbished-computers/hp-8200-elite-tower-i7-4gb-250gb/ (with ram maxed out 32gb) and this: https://www.paradigit.nl/msi-gtx-1650-d6-ventus-xs-ocv1/21034633/product/3118 together +/- 460 euro

In NL i pay 22.95 euro/month for apple one family plan (iCloud+, music, arcade and appletv+); if i remove arcade, which is the shittiest service, sum of individual subscriptions goes up to 26+ euro…

At least, there is no news about price increase (for the time being)