Lee, 23, is 6-foot-5 and was just waived by the Jazz. He was originally drafted by the Pistons with the No. 38 overall pick in 2020, GM Troy Weaver‘s first draft in Detroit. Lee appeared in 48 games as a rookie, and then 37 games last year, averaging 5.6 points each season.
Arms, 24, is 6-5 and went undrafted out of Texas Tech. He then signed an Exhibit 10 contract with the Nuggets in July, before being waived earlier this week.
Jackson, 24, is 6-3 and spent the past two seasons with the Pistons, averaging career-highs of 10.6 points and 53 percent shooting last season.
Originally drafted with the No. 31 overall selection out of Duke in 2017, Jackson played for the Pelicans in his first three NBA seasons. He missed all of his rookie year with a foot injury.
The Suns signed Jackson to a camp deal on Sept. 21.