I would use telegram API sendphoto function to send photo message in Google App Script.
the photo is Blob file, which generated from chart.getAs('image/png').
https://developers.google.com/apps-script/reference/charts/
In Reference https://core.telegram.org/bots/api#sendphoto, it say
Post the file using multipart/form-data in the usual way that files are uploaded via the browser
Do it mean i cannot upload using the telegram api?
If can, Can i use the below google app script to upload photo?
UrlFetchApp.fetch("https://api.telegram.org/botXXXXXXX/sendPhoto?chat_id=YYYYYYYY&photo=" + blob);
