You can do plenty with 4 gig.
Teclast T50 is out, Android 11, one glass solution 11 inch screen, (their new incell screens are epic, 350nits and 120 hz refresh rate) 7500mah battery, and if you want more memory 8gig ram/128gig rom. But to give you some idea, I tested a 44gig MKV file on my old teclast m20 with 4 gig ram took about 5 seconds to buffer and played flawlessly. 4 gig is plently and handle HD content perfectly.
If you going to do media and documents, 11 inch would be the way to go. That incell screen is going to be what you need.
R3800+- + plus get the cover, you won't find any thing local.
1. Android 12 operating system <br>2. Unisoc T616 octa core (2x Cortex-A75 2.0GHz + 6x Cortex-A55 1.8GHz) <br>3. GPU: Mali-G57 750MHz <br>4. 8GB LPDDR4 RAM + 128GB eMMC5.1 ROM <br>5. 11 inch IPS capacitive screen, 2000x1200 resolution <br>6. Support Bluetooth 5.0, 2.4/5G WiFi, dual 4G SIM <br>7...
www.sunsky-online.com
1. Simple, comfortable and easy to carry<br>2. Fully protect the device from normal scratches, dirt, tears and abrasions<br>3. Bracket function, easy to use<br>4. All buttons and ports are easily accessible<br>5. With good performance, it may work for a long time.<br><br>
www.sunsky-online.com
The T50 is priced so well at the moment, it makes zero sense to get the M40 air, which is 800 odd cheaper.