ORCHARD PARK, N.Y. — At the far corner of the practice field, far away from the Buffalo Bills’ other wide receivers, Joshua Palmer listened to an athletic trainer’s instructions. Palmer couldn’t catch passes from Josh Allen during voluntary workouts, and it was still too soon for Palmer to join the receivers for individual drills. Nearly eight months since he writhed in pain on the grass at Atlanta’s Mercedes-Benz Stadium, Palmer is still recove…