Evolve Transition Infrastructure (SNMP) SC 13D Sanchez Midstream Partners / SP Common Equity Subsidiary ownership change

Exhibit B

JOINT FILING AGREEMENT

The undersigned hereby agree that the statement on Schedule 13D with respect to the Common Units of Sanchez Midstream Partners LP, dated as of September 17, 2020, is, and any amendments thereto (including amendments on Schedule 13G) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934.

	SP COMMON EQUITY SUBSIDIARY LLC
	By: SP Common Equity LLC, its sole member
	By:	/s/ Antonio R. Sanchez, III
	Name:	Antonio R. Sanchez, III
	Title:	Managing Member
	SP COMMON EQUITY LLC
	By:	/s/ Antonio R. Sanchez, III
	Name:	Antonio R. Sanchez, III
	Title:	Managing Member
	ANTONIO R. SANCHEZ, III
	/s/ Antonio R. Sanchez, III
	ANTONIO R. SANCHEZ, JR.
	/s/ Antonio R. Sanchez, III, Attorney in fact
	PATRICIO D. SANCHEZ
	/s/ Antonio R. Sanchez, III, Attorney in fact
	EDUARDO A. SANCHEZ
	/s/ Antonio R. Sanchez, III, Attorney in fact
September 17, 2020