TG_BOT_TOKEN:

• get a token by talking to @BotFather

TG_BOT_USERNAME:

• your bot username, without the '@' symbol.

TG_DUMP_CHANNEL_ID:

• create a Telegram Channel.
• Add your bot, created in previous step to the Telegram Channel, (as an administrator).
• Send a message in the Telegram Channel.
• Right Click on the Message > Copy Link.
• you will get a link in the format: https://t.me/c/12374356/3
• the value -100 and 12374356 combined without spaces is the value of this KEY.

TG_AUTH_USERS:

• send /id command to @googleIMGBot to get this value. [ atleast, two users are required ]
• you can also set ALL value in this field, to give everyone access to your File Sharing RoBot.