Well, the original request is about adding a shortcut from the DSM desktop to the existing bliss interface, not about adding a native UI. I didn't see anything specific in the original request about native UI.

Frankly it's unlikely I would look to put resources into a native UI. To maintain that alongside other builds would be too much work.

@Dean yes I think this is what all here in this want to see.

Currently bliss works like this on Diskstation:

1 Start. Diskstation -> Open Diskstation URL with bliss port sample -> http://192.168.0.12:3220
-> if now someone want to get this working in public internet the router needs to setup to redirect that port of course.

2. Start Bliss in DSM in APPList
-> DSM opens in current Browser new Tab with the current chosen BaseURL connected to DSM and add the Port of Bliss -> http://mydmspublicip_MAYQUICKConnectURL:3220
But again if the local router is not setup to redirect that port correctly the new tab is "empty" because not reachable from outside the world.

Of course on Local Networks all works fine all the Time -> but still not embedded in DSM.
Its always like direct webpage access to bliss!

See this Google image links:

-> DSM or MainWebinterface or Dashboard of Synology NAS (the web admin portal) or Full official name will be "DiskStation Manager" the current version from Synology is DSM 6.2.2-24922 Update 4
-> On left side in Background you see "Apps" dragged to Desktop
-> On left top side you see four squares this is the all Apps view where currently bliss will be installed because its an APP. See second Image link
https://www.google.com/imgres?imgurl=http%3A%2F%2Fwww.disczone.net%2Fwp-content%2Fuploads%2F2015%2F12%2FDSM6-1.jpg&imgrefurl=https%3A%2F%2Fwww.disczone.net%2F2015%2F12%2F18%2Freview-of-synology-diskstation-ds216play-software%2F&docid=hWqq70xCAwJhxM&tbnid=m1dHZ89H_uXskM%3A&vet=10ahUKEwjfm9HOxJfmAhUhMewKHWB0BwcQMwhDKAAwAA..i&w=1024&h=768&safe=off&client=safari&bih=891&biw=1324&q=dsm6&ved=0ahUKEwjfm9HOxJfmAhUhMewKHWB0BwcQMwhDKAAwAA&iact=mrc&uact=8

-> Installed apps list with Bliss
https://glassofdutchwine.files.wordpress.com/2012/09/bliss-webui.png?w=625

Personally I am a Developer so just "add" the feature to let the app placed on Desktop is not enough.
The App must have it own UI and not a Webbased one.
to be usable directly inside of DSM. See Sample App on next Image link:

DSM Desktop or "DSM Desk" in background with the installed APP AudioStation running.
https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=2ahUKEwiq8bjIxpfmAhVE_aQKHdyFAIwQjRx6BAgBEAQ&url=https%3A%2F%2Fwww.tweakpc.de%2Fnews%2F30817%2Fsynology-diskstation-manager-dsm-5-0-zum-download-bereit%2F&psig=AOvVaw1g5tAdvOsS4_PoZiWYN_w1&ust=1575396239613330

Generally DSM is a linux based OS so you need to create an UI.

Synology Developer Area:
https://www.synology.com/en-global/support/developer

Release Notes for my NAS DS218
https://www.synology.com/de-de/releaseNote/DS218

Oh - @Christian L. are you referring to apps with native UI? Yeah, that would be difficult to do. I imagined some web control that was embedding the bliss UI so you could see it within DSM.

The other apps are just apps, they aren't a server, I don't think you can do that with a server.

Can you give me some example apps so I can see how they work?

Because of IPV6 and other stuff I am not able to use Bliss outside my home. (Diskstation installation)

So I think the original Author wants the same like me:

Instead of open Bliss in separate Browser window -> it should be open inside of the DSM Website interface. Like lots of other apps available for Synology Diskstation.

This would solve a lot of my Problems

Not a workaround, it's just the only way to add an installed app icon on the synology desktop.
I don't think there's another way...

Thanks Fred... is that a workaround?

I guess it would still be good if this were added during installation.

gabylu, open the quick menu (top left icon) and just drag and drop the bliss icon on the DSM desktop.

What is "DSM desk"? The web interface for DSM?