Overseerr

Features

Full Plex integration. Login and manage user access with Plex.
Syncs to your Plex library to show what titles you already have.
Integrates with Sonarr and Radarr. With more services to come in the future.
Easy to use request system allowing users to request individual seasons or movies in a friendly, clean UI.
Simple request management UI. Don't dig through the app to approve recent requests.
Mobile-friendly design, for when you need to approve requests on the go.
Granular permission system.
Localization into other languages.

Click only the links in the application and do not use any browser functions [refresh, back, forward etc] and you will not be prompted for re-authentication. This is due to Overseerr not having a base URL function implemented. This is out of the control of Ultra.cc and will be improved once Overseerr supports base URL.

Prerequisites

Plex Media Server is installed and configured.
Radarr is installed and configured.
Sonarr is installed and configured.

Setup

Connect to your Overserrr instance from the Control Panel.
Sign in to Overseerr using your Plex account.

Plex Settings

Click the button with the refresh symbol beside Server.
Set up the connection with the following details:

Server : Manual configuration
Hostname or IP Address: 172.17.0.1
Port: Plex Media Server's Port from the Control Panel.
SSL: Unchecked

Click on Save Changes.
Then, click on the Plex libraries that you wish to Sync with Overseerr and after that, click on Start Scan.
Finally, click on Continue.

Radarr Settings

Click on Add Radarr Server and also log in to your Radarr instance on a different browser tab.
Set up the Radarr Server with the connection details given below:

Default Server: Checked
Server Name: Radarr (The value can be anything of your liking.)
Hostname or IP Address: {username}.{servername}.usbx.me
Port: 443
Use SSL: Checked
API Key: API key from Radarr found at `Settings -> General` under `Security`.
URL Base: /radarr

Click on Test.
Set the Quality Profile & Minimum Availability as per your liking and the Root Folder should be /home/{username}/media/Movies by default.
Click on Add Server.

Sonarr Settings

Click on Add Sonarr Server and also log in to your Sonarr instance on a different browser tab.
Set up the Sonarr server with the connection details given below:

Default Server: Checked
Server Name: Sonarr (The value can be anything of your liking.)
Hostname or IP Address: {username}.{servername}.usbx.me
Port: 443
Use SSL: Checked
API Key: API key from Sonarr found at `Settings -> General` under `Security`.
URL Base: /sonarr

Click on Test.
Set the Quality Profile & Language Profile as per your liking and the Root Folder should be /home/{username}/media/TV Shows by default.
Click on Add Server.
Finally, click on Finish Setup.

Tautulli Settings

Go to Settings -> Plex.
Configure the Tautulli settings as follows:

Hostname or IP Address: {username}.{servername}.usbx.me
Port: 443
Use SSL: Checked 
URL Base: /tautulli
API Key: API key from Tautulli found at `Settings -> Web Interface`
External URL: Leave Blank

Click on Save Changes.

Upgrade Overseerr

Currently, Overseerr can not be upgraded from the Control Panel.

app-overseerr upgrade