Unfortunately, as I have already told you in another post, the use of universal libraries is not so simple and immediate, especially the first impact, but after a couple of weeks I can say I understand something.
I just posted a complete example which includes both a screenshot of the display and SPIFFS memory management via the Arduino IDE serial port.
I saw you have an Ili9488 but it is I2C, mind mine is SPI, but apart from the different configuration, you can see if my example helps you.
I don’t know what you have to do, I also enjoy 3D RC flying and I like to build my own models.
I tried to control 4 servos and 3 motors with an Arduino Nano, but if it worked for the servos, the speed varied too much for the motors.
Esp32 is certainly better but I have not yet had time to try it connected to the receiver and above all to the motors.
My post if you are interested is here: Esp32 use with LVGL library...need a little example - #4 by gabriele_ponte and the screen I use it I bought it here: Driver ottico ILI9341 del pannello di tocco dello schermo di visualizzazione del modulo LCD TFT seriale SPI 3.5x320 da 480 pollici per MCU|Car Monitors| - AliExpress
Hello and good fun