We are left with about 5 gig after amazon OS and additional bloat. They just want you to live in their sphere and use the apps provided that they have partnered with. They permit sideloading knowing it is a selling point but they do not care that you run out of space adding your APK's.

You can easily add additional storage with an OTG cable. Before I gave mine to family I had them all set up with an OTG

https://www.amazon.com/AuviPal-Micro-USB-Cable-Power/dp/B07FY9Z9GD/ref=sr_1_3?dchild=1&keywords=OTG+cable&qid=1631209628&s=electronics&sr=1-3

But I used this style

https://www.amazon.com/AuviPal-Powered-Adapter-Charging-Streaming/dp/B07TX8FY6W/ref=sr_1_2?crid=1O4LJE3XWOP15&dchild=1&keywords=otg+adapter&qid=1631209688&s=electronics&sr=1-2

I used powerd usb 3.0 hub with ethernet. I prefer future proof and overkill even if the micro usb part isn't as fast on the stick. I did not like the UGREEN I posted below because the blue led was super bright, good quality. I can't find the link to the ones I ended up using that did not have a light. But you can get a cheaper one that isn't powered also.

https://www.amazon.com/UGREEN-Ethernet-1000Mbps-Nintendo-Chromebook/dp/B00LLUEJFU/ref=sr_1_91?dchild=1&keywords=powered+usb+ethernet+3.0+hub&qid=1631209885&s=electronics&sr=1-91

This way you have USB for storage, keyboard, and ethernet for better more solid performance.

I also recommend the Fire tv debloat tool and the Wolf Launcher for best performance.

You can google any of that for help, instructions and visuals.

Try these:

https://www.amazon.com/AuviPal-Micro-USB-Cable-Power/dp/B07FY9Z9GD

or this

https://www.amazon.com/AuviPal-Powered-Adapter-Charging-Streaming/dp/B07TX8FY6W

plus this

https://www.amazon.com/UGREEN-Ethernet-1000Mbps-Nintendo-Chromebook/dp/B00LLUEJFU/ref=sr_1_9

and this

https://www.amazon.com/SanDisk-32GB-Ultra-Flash-Drive/dp/B077VXV323/ref=sr_1_5

and you're good to go. I have this setup on 9 different systems, all work flawlessly. Move all your apps to the disk (disk set up as extended internal storage) thus freeing up space and improving performance. The internet adapter you show has a limit as to the allowed speed (100).

UGREEN USB 3.0 Hub Ethernet... https://www.amazon.com/dp/B00LLUEJFU?ref=ppx_pop_mob_ap_share

https://www.amazon.com/dp/B00LLUEJFU?ref=ppx_pop_mob_ap_share

This is the Ugreen hub I use. 👆 My internet download speed is 300 Mbps, which is what I get when hard wired. 👍

UGREEN Ethernet Adapter USB Gigabit Network Adapter 10/100/1000Mbps/1 Gbps with USB 3.0 Hub 3 Ports for Nintendo Switch, Wii, Windows Surface Pro, MacBook Air/Retina, iMac Pro, Chromebook, and More PC https://www.amazon.com/dp/B00LLUEJFU/