Solved Issues

• Using method getFile (https://core.telegram.org/bots/api#getfile) does not always return the same path. The link to files is not stored at database due to it's necessary to request every time. See: https://github.com/gilpanal/beatbytebot_api/blob/master/src/resolvers.js

• Getting a file from Telegram without exposing Bot Secret Token in the client side. Example: https://gist.github.com/gilpanal/099ff5fc94366fbaabd5e2fbedc7c86f

• For method fileUpload in helpers.js was required to add maxContentLength and maxBodyLength equal to Infinity

 await axios.post(API_BOT + BOT_TOKEN + '/sendAudio', form, {
        headers: {
          'Content-Type': `multipart/form-data; boundary=${form._boundary}`
        },
        'maxContentLength': Infinity,
        'maxBodyLength': Infinity
      }).then(async (responseTelegram) => {
        uploadResponse = await handleResponseFromTelegram(responseTelegram, req.body.chat_id)      
      }).catch((err) => {  
        const error = err && err.response && err.response.data    
        uploadResponse = error
      })