I keep seeing these kinds of videos from over a year ago so here’s one that includes more recent interviews as well
Credits:
1) Kit Connor and Joe Locke take the BFF Test- Buzz Feed UK:  Kit Connor and Joe Locke take the BFF Test
2) The Heartstopper Cast Answer Your Fan Questions- Still Watching Netflix: The Heartstopper Cast Answer Your Fan Ques...
3) The Cast of "Heartstopper" React to S1 Bloopers -Netflix After School: The Cast of "Heartstopper" React to S1 Blo...
4) Heartstopper's Kit Connor & Joe Locke Remember Their "Firsts" - Teen Vogue:
Heartstopper's Kit Connor & Joe Locke Reme...
5) 'Joe Is Just So So Soft': Kit Connor & Joe Locke Answer The Internet- Hits Radio: 'Joe Is Just So So Soft': Kit Connor & Joe...
6) Heartstopper's Kit Connor & Joe Locke Swap Roles in Arcade Scene- Still Watching Netflix: Heartstopper's Kit Connor & Joe Locke Swap...
7) Kit Connor and Joe Locke Answer Fan Questions- Still Watching Netflix: Kit Connor and Joe Locke Answer Fan Questi...
8) Kit Connor and Joe Locke Take YOU On A Tour Of London- Still Watching Netflix:
Kit Connor and Joe Locke Take YOU On A Tou...
9) Can the Heartstopper Cast Remember Their Lines?!- Still Watching Netflix: Can the Heartstopper Cast Remember Their L...
10) The Heartstopper Cast Try Cake Decorating-Still Watching Netflix: The Heartstopper Cast Try Cake Decorating ...
11) Alice Oseman Teaches The Cast Of Heartstopper How To Draw Nick and Charlie- Still Watching Netflix: Alice Oseman Teaches The Cast Of Heartstop...
12) Kit Connor and Joe Locke Spill on Season 3- Still Watching Netflix: Kit Connor and Joe Locke Spill on Season 3...
13) The Heartstopper Cast Plays Who's Who?- Still Watching Netflix: The Heartstopper Cast Plays Who's Who? | N...
14) Joe Locke & Kit Connor Rate English And USA Food | Snack Wars- LADbible TV: Joe Locke & Kit Connor Rate English And US...
15) INTERVIEW + EXCLUSIVE CLIPS: 'Heartstopper' Stars Kit Connor and Joe Locke on Sex Scenes & Surprises- Gayety: INTERVIEW + EXCLUSIVE CLIPS: 'Heartstopper...
16) “It was a volcano on his chin!” 🌋😂 Joe Locke and Kit Connor talk Heartstopper series 3- BBC Radio 1: “It was a volcano on his chin!” 🌋😂 Joe Loc...
17) Heartstopper’s Kit Connor & Joe Locke Take a Friendship Quiz- GQ: Heartstopper’s Kit Connor & Joe Locke Take...
18) In Bed With Kit Connor and Joe Locke- Still Watching Netflix: In Bed With Kit Connor and Joe Locke | Net...
19) Hugo Gloss entrevista o elenco de "Heartstopper"- Hugo Gloss: Hugo Gloss entrevista o elenco de "Heartst...
20) Joe Locke and Kit Connor On Heartstopper Sex Scenes and Their Big Night Out-Cosmopolitan UK: Joe Locke and Kit Connor On Heartstopper S...
21) Heartstopper's Kit Connor And Joe Locke On Fashion Regrets, Season 3 Memories And More-ELLE UK: Fashion Regrets with Heartstopper's Kit Co...
22) Heartstopper’s Kit Connor & Joe Locke Take on a Painting Challenge | Vogue Challenges- British Vogue: Heartstopper’s Kit Connor & Joe Locke Take...
23) Various online sources