only syncs that day's activity and not history

1. Did you get an answer? I have same pro lem

To solve your immediate problem, you can import the missing activities manually from the gear icon list of activities web page in Connect web. 

Not sure about how to fix this going forward.

Unknown said:

I have same pro lem

If only one part of the data is syncing, then use the tips from the Troubleshooting guide for (some) data missing after syncing, 

... a highly probable reason for your problems are duplicate accounts. I see two of them for your user name, and since it sounds rather unique, I'd bet they are both indeed yours, and hence causing the loss of data:

Use the hint #3 in the troubleshooting guide to fix the problem

Is the troubleshooting guide on my phone app? I can't find it.

Unknown said:

Is the troubleshooting guide on my phone app?

No. The guide was created by trux. Available only on this forum using a web browser, such as you are now on this thread.

Unknown said:

Is the troubleshooting guide on my phone app? I can't find it.

Did you try clicking or atpping the link? It will open in your browser. It does not matter whether you are on a phone or on a computer.

I don't know what link you mean. I don't see a link on this thread.