Look for this 

[HookMethod("SendImage")]
public void SendImage(BasePlayer player, string imageName, ulong imageId = 0)
{
if (!HasImage(imageName, imageId) || player?.net?.connection == null)
return;

uint crc = uint.Parse(GetImage(imageName, imageId));
byte[] array = FileStorage.server.Get(crc, FileStorage.Type.png, CommunityEntity.ServerInstance.net.ID);

if (array == null)
return;

CommunityEntity.ServerInstance.ClientRPCEx<uint, uint, byte[]>(new Network.SendInfo(player.net.connection)
{
channel = 2,
method = Network.SendMethod.Reliable
}, null, "CL_ReceiveFilePng", crc, (uint)array.Length, array);
}

replace this with this 

[HookMethod("SendImage")]
public void SendImage(BasePlayer player, string imageName, ulong imageId = 0)
{
if (!HasImage(imageName, imageId) || player?.net?.connection == null)
return;

uint crc = uint.Parse(GetImage(imageName, imageId));
byte[] array = FileStorage.server.Get(crc, FileStorage.Type.png, CommunityEntity.ServerInstance.net.ID);

if (array == null)
return;

Network.NetWrite write = CommunityEntity.ServerInstance.ClientRPCStart("CL_ReceiveFilePng");

CommunityEntity.ServerInstance.ClientRPCWrite<uint>(write, crc);
CommunityEntity.ServerInstance.ClientRPCWrite<uint>(write, (uint)array.Length);
CommunityEntity.ServerInstance.ClientRPCWrite<byte[]>(write, array);

CommunityEntity.ServerInstance.ClientRPCSend(write, new Network.SendInfo(player.net.connection)
{
channel = 2,
method = Network.SendMethod.Reliable
});
}

yur welcem

Will need to restart the server 

or

try in console below

refreshallimages
yes

reload mods