Activity not show on app

I walked 5 miles around 5 am this morning and it does not show as an activity walking? However,  it shows steps.

Same here. Yesterday was weird... 

Have you started and stopped the Walking activity manually? If you do not know how to do it, have a look in the user manual of your watch for the instructions:

https://www8.garmin.com/manuals/webhelp/vivoactive3/EN-US/GUID-90B3EF66-C7DC-4BB5-A1A3-C07E1E9E7A57.html

Yes. It was training program activity from Garmin Connect 5k subscription. Everything was as usually.. 

Basically there are three possibilities:

1. The storage (or the FIT file storing the HR data and the steps data) is dammaged or full. Try deleting old activities from the folder //GARMIN/Activity, to see whether it helps, or contact the user OnlyTwo for the help with the FIT file repair.
    
2. The synchronisation does not work (the white circle around the watch symbol never closes) - in that case follow the tips in the Sync / Connection Troubleshooting Guide 
   
   

3. When the synchronisation works (the white sync circle closes and turns green), but not all the data is appearing in your account, then it very probably means that your device is associated with multiple accounts, and a part of the data lands in the other account. It frequently happens for example when you reinstall the application, and inadvertently sign up a new account instead of signing into the original one. Follow the instructions from the support document Data is Missing from My Garmin Account After Syncing to resolve the issue.

Garmin Explore is syncing that activity without problem. I have it in there. But in Connect, no. Only steps, heart rate, sleep.. everything except the activity.. I try it ad manually. But later, at home. Thnx for your time

Hello. I connect it to PC and everything is fine. Activities are in Garmin Connect as usually. Thanks for feedback.