pete

Take a look at Calibre-Web (github.com/janeczku/calibre-we…) which I've been using for what you ask for quite a while now. As the name suggests it can also take advantage of a pre-existing Calibre eBook Database.

What model is the router? I suspect it is a router your provider equipped you with? In that case, with a 500Mb download bandwidth contract it would be really crazy of your provider to hand you a router with 100Mb ports ;-)
In either way looking up specifications of the router model will help here.

I would not upgrade the contract, even if you go beyond your 50mbit UPLOAD speed you won't be sure that no buffering and hence drop in streaming will happen. Note you have a "500Mb Broadband" contract but the upload is limited to 50Mb. Asymmetric bandwidth is typical for "consumer" internet you mostly consume/download - contrary to "hosting" internet uplinks which typically are symmetric and very pricey since you are typically hosting/uploading.

You need specialised software to make sure you can transmit big, uncompressed real-time data (which video basically is) over the internet. It's basically what Youtube does for its users.
It hosts arbitrary uncompressed video data you upload to it (this is your NAS - which you have now) and then displays that data to users on the web in a compressed, streaming fashion (this is what streaming software would handle - which you do not have yet).

In your scenario issues will arise, naturally.

M500 broadband package boasts average download speeds of 516Mbps and average upload speeds of 52Mbps

So, while viewing media from outside your local netwwork, i.e. via Synology QuickConnect, you're limited to 52mbit speed.
If you're self-hosting upload speed matters alot unfortunately. You will surely need something that buffers / transcodes your media for viewing from the internet.

There's something to that claim. Sending uncompressed (i.e. not transcoded) video content over the internet can easily saturate your internet link.
Do you have CIFS/Samba, in other words Windows Network Explorer access to the files on the NAS via your local network? If so try directly opening a video and look at the network dashboard of the NAS and/or your computers task manager (performance -> ethernet tab) to see to what mbit bandwidth the not transcoded stream amounts too.
Consider that the exact same mbit bandwidth will be needed using Synology QuickConnect to view media from outside of your local network.

If you want to work around all that you would probably have to look into something that buffers/transcodes your media, something like Jellyfin/Plex or the likes. For that you'd have to look into running Docker on the NAS but that'll plunge you into self-hosting very deep very fast and may be beyond your initial comfort zone.

500 fibre connection means it is a 500mbit internet uplink?
Have you checked whether the ethernet cable you're connecing the DS216j to your router is a "Cat5e" cable. If it is a "Cat5" you would be limiting and thus bottlenecking your bandwidth to 100mbit max.

Plus, Jitsi Meet will allow you publicly available video conferencing which is really nice to have on its own. ;-)

It's pretty solid for 1:1 calls, and they are currently working on Matrix's own conferencing protocol/solution.
But until then you could set up a Jitsi Meet instance along with Matrix to run multiple user calls.

I'm trying to stay away and I do feel like there is a reasonable chance I might be able to.
I recently subscribed to a Lemmy "self-hosted" and "asklemmy" group and content is starting to trickle in real good.

Mostly I feel it's a matter of consolidating Lemmy groups with the same topics into super-groups. This should help with general useability as well as making things more friendly for people moving over from Reddit.
Federation support for other Fediverse products towards Lemmy also will need some work still.

"Necropolis" (Gaunt's Ghosts 3) by Dan Abnett. Whole lot of Warhammer 40k goodness.

Und anders herum betrachtet, jenen mit größeren Vertrauen könnten möglicherweise subjektiv weniger abstrakt erscheinen, oder einfach nur im täglichen Leben ebenso subjektiv vorherrschender sein.