I have a later Miles W. Flinn, born c. 1825, per the census, and wife Isabella Robbins, c. 1825 in Rutherford Co, NC.Could this be a son of your Miles?
Rutherford Co Tax Deficiencies, 1841-1868 Sep 1850 Probate Court lists Miles Flinn as "person removed and insolvent in county."per Nov 2001 Old Tryon Bulletinp 178.
Rutherford County 1860 Census Records: Miles Flin35NC#1274 Iby 35 Nancy 14 Malena 12 John 8 Joseph 6
Rutherford County Deed Index Flinn, MW & Isabaella / Fowler, L / Deed/55/558/1881
My ancestor Paul Flinn (1791-1868) was in Rutherford Co, NC as early as 1816 when he is listed on a road-building crew.Could there be any relationship?His father was John Flinn, who died after 1817, but if he had a son named Miles, I don't know anything about it.Would be interested in hearing more from you.