NextCloud and Nginx Proxy Question

Hi everyone, I had just upgarde from core to scale, there alot of question for myself now, after I google I am very confuse.
I use my Truenas for
immich (family photo backup)
Plex (video share)
nextcloud(family from diffence city could share files)
palworld (game server)

Question 1.
I want to host my nextcloud on my domin, I try to use cloudflare Tunnel, but It turn out upload speed very slow. is it other way to do it?
Question 2.
I want to install Jdownloader, I had try dockage and Portainer but cant get it work.

Thank you
17-2600k 4x8TB HDDs raidz 1x8TB sec Photo backup

Have you checked out the articles in the resources section of the forum? I believe there is one on this or a very similar topic.