Yesterday activity still does not sync on app

Try doing it manually: How Do I Manually Upload an Activity I Recorded to Garmin Connect? | Garmin Customer Support

i said that i dont have PC

Then try to get to one - at a friend, in the family, at work, or even a public one. Macs work too.

If not possible, then contact the Product Support, but they can barely help you, if you do not have the possibility to access the storage of the watch.

are they gonna fix it so it can be upload without doing it manualy or there is no other way than upload it manualy? tnx for your time

I do not know about any way to fix it, without the access to the file, if the problem is in the activity.

i dont think that the activity have the problem but app.

... however, if the problem is not the activity file itself, but you have more problems with syncing data, then this post could help: Troubleshooting guide for (some) data missing after syncing