[1] For his first three seasons at Bishop Gorman, Collins came off the bench and played alongside fellow seven-footers and McDonald's All-Americans Stephen Zimmerman and Chase Jeter.

[6] In the summer of 2015, Collins competed in the FIBA 3x3 Under-18 World Championships, where he teamed up with Jalek Felton, Payton Pritchard and P. J. Washington and won the USA tournament.

[7] His team advanced to the final 16 where they defeated Poland, but then lost a close game to France, featuring fellow Gonzaga commit Killian Tillie, in the quarterfinals.

[11] Collins helped to lead the West squad to a 114–107 win in the while scoring nine points, along with six rebounds, three assists and two steals on 3-for-5 field goals and 1-for-2 three-pointers in 12 minutes of play.

[19][20] At the conclusion of his freshman season, Collins announced his intention to forgo his final three years of college eligibility and enter the 2017 NBA draft.

[24] On November 5, 2019, the Trail Blazers announced that Collins had undergone successful surgery in repairing his left labrum and was expected to be sidelined for about four months.

[25] On December 30, 2020, the Trail Blazers announced that Collins had undergone successful surgery in repairing his left medial malleolus stress fracture,[26] and as result he missed the entire season.

[27][28] As he was recovering from his previous injury, Collins refractured his foot, and on June 29, 2021, the Trail Blazers announced that he underwent a second revision surgery to repair his left medial malleolus stress fracture.