How do I know if my amended tax return filed or not

[CapB]

Although you can prepare an amendment online, it is not possible to e-file an amendment. The IRS does not allow amendments to be submitted electronically; amended returns must be mailed.

Wait  for your original return to be accepted by the IRS before printing, signing, and mailing your amended return.

You can track your amended return 3 weeks after you mail your amendment using the IRS tracking system. See FAQ below to track your amended return.

https://ttlc.intuit.com/replies/4173080