Offline Music App

Hi, I’ve been working on creating an Offline Song App that uses mp3’s. It’s been around 2 months and I’ve been getting ChatGpt to guide me through what to do. I’ve had a 955 page conversation with it in regards to it. I finally got a 20 song Playlist going after alot of trial and error but then I also wanted for the user to toggle on and off for the same songs. This I found, didn’t quite gel with the blocks I’d already done. Nonetheless, the toggle blocks worked for the two screens I’d done them for, but for the rest of the app’s screens, the Playlist codeblocks ran the show well UNTIL I thought to add a screen at the beginning. Because of that, understandably, I probably wrecked whatever code I had in place on it seems, all of the block screens and then nothing played back. My fault but that was a long education. Now I’ve created only play single mp3’s when tap the button type set up, which is working very well. Nonetheless, I am still curious as to how to create a playlist. I followed the instructions that before I did but curiously, nothing played back. O.o I understand about uploading mp3’s to Assets, adding buttons to screens, adding the VIDEO (which is actually also the AUDIO) button to the screens then adding the Mp3 audios to the ‘source’ area on the right hand side. But I do not understand this ‘set Sound1.source to ‘song1.mp3’ (whcih sets the audio file to play and then I can’t also find the ‘call Sound1.Play’ which starts playing the audio. I can NEVER find the ‘Sound1.source’ - I can’t see it anywhere. Not to mention I can never find the ‘call Sound1 Play’ - I can’t see that anywhere either. This seems to be the last thing I haven’t grasped - no matter what I do. It just isn’t inside the Thunkable block screen? Is it because it’s 2025 and there are different instructions now? Thank you so much for your help! - Shelley