https://www.instructables.com/id/Make-Blynk-Switch-IoT-4CH-Only-Use-Smartphone-ESP8/

A tool runs on Android platform to create an IoT project easy.
Makes it easy to upload binary file (result of compiled Arduino IDE) to any Expressif ESP8266 development board via USB OTG or WiFi (OTA).

Features:
★ Upload/Flash bianry file via USB OTG
★ Upload/Flash bianry file via WiFi (OTA)
★ Support any USB chip: CDC/ACM FTDI PL2303 CH34X and CP210X
★ Serial Monitor for debuging
★ Change the Blynk token SSID & password automatically durring upload
★ No Ads (Pro version)
★ Access to Google Drive storage (Pro version)
★ Multiple upload widgets button (Pro version)

Note:
- Your device must support USB Host OTG otherwise the program will not work
- Use good quality OTG adapter/cable otherwise the uploading failure
- If you get error: "Failed download. Check network connection." You can try to download the required file manually from this link:
https://github.com/bluino/ESP8266Loader and https://github.com/bluino/ESP8266Loader_extra
then extract it to internal storage so that you will have the /sdcard/ESP8266Loader folder.

Warning: Try it on your own risk it can damage your hardware (Android or ESP board) or lead to data loss (binary file or any Android data).