Taylor Swift Cries in Eras Tour Docuseries

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Taylor Swift becomes visibly emotional in her new “The End of an Era” docuseries releasing Friday on Disney+ as she discusses the hard work that went in to pulling the record-breaking tour off.

Check out the new preview shared by "Good Morning America" Thursday morning -- Taylor and her mother, Andrea Swift, are expressing how massive of a job creating and perfectly executing the Eras Tour was -- including adding in a whole new album era for dates later in the worldwide trek.

At one point, the "Fate of Ophelia" hitmaker can be seen emotional and wiping a tear from her cat-winged eye.

She notes ... "This is the biggest challenge any of us have ever done. We had to be…