reledmac use one individual file by series of endnotes : .Aend, .Bend, .Cend etc. See the changelog in reledmac handbook or https://github.com/maieul/ledmac/commit/7fedc07f5bf2af21c86a237957790cb6fdce78a7#diff-60c898960cc69e6fde87e84ddef7d910R11391