Xbox One won’t pick up my external storage device

Good evening ManLikeAndo,

For an external storage drive to save games and apps from Xbox One, it must meet the following requirements:

• It uses a USB 3.0 connection. If you’re using a USB hub, the hub must also be USB 3.0 or later.
• It has 256 GB or larger storage capacity.
• It has a partition. Typically, drives come wit a preformatted partition. For more information about partitioning an external hard drive, refer to the manufacturer’s instructions.
• No more than three storage devices are connected to the console at the same time.

Some companies do meet these requirements but the formatting of the drive is incorrect, check online to ensure the one you have will operate correctly.

Regards

try connecting the drive to a pc and format it to ntfs in the option when formatting it

Try performing a hard reset EXACTLY like this. Hold the power button on the console for 8 seconds or until the power shuts down completely.
Unplug the power cord from the back of the console for 5 minutes.
Plug the power cord back in and restart the console.

I'm using a Seagate Backup Plus 2TB 3.0 usb external hdd and I haven't had any problem at all. Below is a copy and pasted article for info on external hdd and FAQ.

A 256GB or larger storage device with USB 3.0.

Note: Any brand/drive should work, as long as it's at least 256GB and USB 3.0.

Note: You can connect up to two storage devices at the same time

Note: If the storage device is connected via a USB hub, it needs to support USB 3.0.

Note: Both USB powered and AC adapter powered will work.

External Storage FAQ

Q: What can I install on my external storage device?

A: You can install games, downloadable content, and apps on your storage device.

Q: Can I store game saves on the external storage device?

A: No. Game saves are automatically stored in the cloud and synced to the Xbox One console.

Q: Can I use the external storage device for music and video playback?

A: No. For the initial release of the external storage feature, media files, including music and videos, are not supported. We are considering this for a future release.

Q: Can I copy or move a game from my internal hard drive to my external storage device?

A: Yes. Check out the content management features by going the Manage page for the game or app.

Q: Can I use my external storage device with my PC as well as my Xbox One?

A: No. The external storage device will be formatted for use by the Xbox One console only. PCs won’t recognize the drive partition created by the Xbox One.

Q: Can I re-format my storage device from my Xbox One console?

A: If you'd like to remove all content from your storage device and start over, you can re-format your storage device on the Xbox One. To do this, go to Settings>System>Manage Storage, choose the external drive you want to format, and select Format. After
this is done, the Xbox One will treat it as a brand new drive.

Note: Formatting causes the storage device to wipe all data.

Q: Do I need to bring my game disc while roaming with my storage device?

A: Yes. The external storage device does not change the licensing for games, so if the game was installed from a disc, the disc is required to play the game.

If you need help with your Hard drive check out the support page
Troubleshoot external storage detection on Xbox One

I followed the guide on that link but it didn't help my problem the device is recognised it's on the list but when I go into media player or even pick it from the list in settings it comes up no device recognised in media player