Telegex.upload_sticker_file

You're seeing just the function upload_sticker_file, go back to Telegex module for more information.
Link to this function

upload_sticker_file(user_id, png_sticker)

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Specs

upload_sticker_file(integer(), Telegex.Model.InputFile.t()) ::
  {:ok, Telegex.Model.File.t()} | {:error, Telegex.Model.errors()}

Use this method to upload a .PNG file with a sticker for later use in createNewStickerSet and addStickerToSet methods (can be used multiple times). Returns the uploaded Telegex.Model.File on success.