Miller, a former quarterback at Ohio State who switched to wideout during his final year with the Buckeyes, was a third-round pick of the Houston Texans in the 2016 NFL draft. He most recently spent the 2018 season on the Philadelphia Eagles' practice squad.
The 26-year-old Ohio native was named Big Ten Offensive Player of the Year in both 2012 and 2013 while playing quarterback but ceded the position to J.T. Barrett and Cardale Jones after missing the 2014 campaign with a shoulder injury.
He hasn't made much of an impact in the NFL, recording 34 receptions for 261 yards and two touchdowns across 21 appearances for the Texans.
In February, Miller said during an appearance on the Beanie and the Boom podcast (via Alexis Chassen of Bleeding Green Nation) he was enjoying his time in Philadelphia despite not cracking the 53-man roster.
"I like it, man," he said. "I like the atmosphere of the locker room, and everybody's cool, nobody got no ego over there, it's solid."
The Eagles waived him Saturday to make room for backup quarterback Josh McCown.
Miller faces an uphill battle to make the Browns' final roster. Cleveland has ample receiver depth, led by Odell Beckham Jr. and Jarvis Landry, even with Antonio Callaway facing a four-game suspension.
The former OSU standout's best chance to earn a spot is likely as a special teams ace while making an occasional impact on offense.