Jurors at Birmingham Crown Court deliberated for under two hours before unanimously convicting the former motor mechanics student of a single count of possessing a recording likely to be useful to a person committing or preparing an act of terrorism.
The week-long trial was told the TikTok user had more than 27,000 followers and had asked another user to send him the 14-minute instructional video via the Telegram app.
He received it in October 2023 and last accessed the video on 24 March last year, the court heard.
At the start of the trial, prosecutor Sahil Sinha said a photograph of Mahmood associated with his social media account showed him wearing a balaclava and featured various weapons, including an axe and a sword.
After his arrest in April 2024 several knives and two sharpeners were found in his bedroom.
During police interviews Mahmood agreed that the weapons were his, but claimed they were linked to an interest in a Turkish TV drama about the Ottoman empire.