I'm trying to mark traffic in the mangle, mark upload but no mark download.

diagram of the network.

pppoe client (public ip) -> mikrotik v5.13 x86 (pppoe server lan) (wan ip routing) -> vendor

mangle:
add action=mark-connection chain=forward comment=\
"Marcado Trafico Cliente Pro DOWN" disabled=no new-connection-mark=\
Cliente_Pro_conn_dn passthrough=yes
add action=mark-packet chain=forward connection-mark=Cliente_Pro_conn_dn \
connection-type="" disabled=no new-packet-mark=Trafico_Cliente_Pro_dn \
passthrough=no

i activated de log, i see the NO_MARK pakets, any suggestions

Are you trying to mark download or upload and where from? Are you trying to mark upload and download from the client or your WAN?