Outside of PWA support i dint think so? That said, I've uploaded before from my phone thru chrome and it was just fine. Some of the sites are also mobile optimized. I used RSSBlue in the past but they're merging services with fountain soon so it doesnt make sense to jump in there until after. There's other options though I'm less familiar with the various options.
Discussion
Do you know of any with a native app?
For uploads? Dont think so. nostr:npub177fz5zkm87jdmf0we2nz7mm7uc2e7l64uzqrv6rvdrsg8qkrg7yqx0aaq7 and the podcast guys would know better though.
For users, i think they all do except lnbeats which has a pwa.
Uploads right in the player app? Not that I know of but nostr:npub196qvw7utjs0cnztlg4aww98ekql9svm6c4wlv6sug70nzz0uujxsprafme makes cool RSS feeds from nostr post.
Any native apps you recommend? Like an app made for music
My favorite is lnbeats but its a pwa. Podcastguru is really good but its mostly for podcasts (in our case, the music podcasts which will curate songs on an hour long music show). It can be a little wonky finding specific tracks. Podverse is a good one but it's not great for discovering new music. Fountain is the cleanest, works well, and has lots of features. But I want to stick with promoting some smaller guys so we have more options.
Using rss for music is relatively new, much like nostr. But there are rss music native apps currently being coded. I know of at least 4 being developed right now.
Music apps are lacking. These are all podcast apps that have music which is why we need MORE APPS!!!
they all kind of suck tbh but LNBeats is great for finding just music, Fountain is also good but limited in its music playing features but if we bug nostr:npub1unmftuzmkpdjxyj4en8r63cm34uuvjn9hnxqz3nz6fls7l5jzzfqtvd0j2 enough maybe he will make it better.
If im trying to discover new music my first goto are the curated music shows using podcastguru (like homegrown hits or nostr:npub1nnkhv7scg4zxr9t6sgukyxn923ed6485ud8m7a3lurr4qd4lhv7qhrp49m). Or else I like to browse lnbeats for individual songs or artists. Ill often go there to find more by a new artist after I hear them on one of the music shows.
This. Make a new npub for music, only upload tracks. These become your podcast feed through Castr.me
The nostr:npub1tn2lspfvv7g7fpulpexmjy6xt4c36h6lurq2hxgyn3sxf3drjk3qrchmc3 podcast feed for instance.
https://castr.me/npub1tn2lspfvv7g7fpulpexmjy6xt4c36h6lurq2hxgyn3sxf3drjk3qrchmc3
Where do you upload the tracks? And how do people stream them easily? Through the nostr client?
post the raw file to the nostr timeline and add the RSS Feed that castr.me gives you to a podcasting app. PodcastGuru handles these well and has video.
https://castr.me/npub1tn2lspfvv7g7fpulpexmjy6xt4c36h6lurq2hxgyn3sxf3drjk3qrchmc3/rss.xml
heres a movie from that feed right in that app.

So the music would be hosted on nostr.build if I understand correctly ?
Yes. For that you would want to compress to mp3 or AAC, depending on what's supported. Higher quality mp3 vbr, or AAC.
I know nostr.build supports mp3. I've uploaded them before.
Does that only work with a paid nostr.build account?
I'm pretty sure mp3 is supported on free tier.
nostr:npub137c5pd8gmhhe0njtsgwjgunc5xjr2vmzvglkgqs5sjeh972gqqxqjak37w can you co firm?
If it doesnt work... can I zap you and pay for a month of nostr.build premium for nostr:npub1rzg96zjavgatsx5ch2vvtq4atatly5rvdwqgjp0utxw45zeznvyqfdkxve?
Audio is supported and always has been. We even have a player https://e.nostr.build
If you have questions let me know. I used to rip and upload a lot of albums to what.cd 😂
yeah wherever your post lives. It just pulls in the mp3s, mp4s and mp4as from your nostr profile.