If you’re using a /24 network the IP shown in the screenshot is the broadcast IP of your network.
445 is the default port for smb. It should be the same on every os if you didn’t manually chang it. 80 is http by default. Did you maybe set it for a Webinterface?
Try adding it manually and enter the IP of your smb server, port 445 and the user/password you set for smb.
I would use NFS instead of SMB. you will have all sorts of problems when you use smb, primarily permissions.
Also I wouldn’t put all the data on the nas. What containers do you want to run? If you try to run something like nextcloud, you can just map your data directory to your nas. Databases, configfiles and so on aren’t that big usually and your application will be a lot faster when those are on your local storage instead of the nas. For actually mapping your containers data to your nas you can just use bind mounts.
For the startup, you can set restart:never in your compose file and start the container with a script after bootup where you out something like ‘sleep 120’ in the beginning.
You can’t install a root CA in Firefox for android.
You have to install the cert in android and set Firefox to use the android truststore.
You have to go in Firefox settings>about Firefox and tap the Firefox logo for a few times. You then have a hidden menu where you can set Firefox to not use its internal trust store.
You then have to live with a permanent warning in androids quick setting that your traffic might be captured because of the root ca you installed.
It does work, but it sucks.