Help! Worried That The 4868 Extension I Filed Through TT Won't Be Valid

I just filed the Free File 4868 Extension through TT to extend the time I have to file my 2019 federal tax return until 10/15/2020.  I got the acknowledgement that it was accepted.

 

When I filed it, I filled in everything correctly except the "estimated" amount of tax due and the taxes already paid.  I put in zero for both of those amounts even though I already did pay some of the taxes through estimated tax, and I also expect to owe additional tax.

 

The reason I did that was because I did not want to pay the additional tax due at the time I was filing that online form but wanted to pay it through my EFTPS account prior to 7/15/2020.  So I put zero for those amounts thinking I was paying zero with that form so that was the correct amount to put down when I eFiled that form.

 

I still plan to pay the additional tax due by 7/15/2020.  There is an option in EFTPS to choose "Extension" for the 1040 when you pay it, and that is the option I plan to use.

 

But the amount I pay won't match the amount on the 4868 I filed through TT because that amount will show zero.

 

Is this going to cause me a problem?  My biggest concern is that it will make the extension invalid and when I later file my 1040 by 10/15/2020 I will be subject to a late filing fee.  Really concerned about that because a lot of tax is due. 

 

This is obviously a question that requires specific knowledge.  Please respond only if you are sure of the answer as I don't want to leave this to a guess!

 

Thank you for any help!