This post is to document my experience transferring characters - there will be 4 in total.
1st IOS 6109 > EL 1509 - success. All thralls and camels accounted for. Spawn location- default desert
Can you also put on the data spawn location? I’m seeing an uptick in dungeon spawning…with all your gear in tow.
2nd IOS 6111 > 1511- success- no thralls or camels. Spawn location default desert
Heres the thing- all thralls and pets dont spawn with you when you import- only your character is placed in the starting location. So if someone is in a dungeon - its just them.
You have to lay a foundation down before you can spawn in your followers.
On a side note- I highly recommend expertise- beast of burden respec so you can setup your new base without having to worry about weight restrictions
Build i used Vit- 20 Authority- 20 Expertise- 20 -literally suits this exact role!
Warparty - still have it!
If if memory serves right, the sigil of the drowned is pretty important.
How many thralls did you transfer?
First transfer was 56 thralls.
I am a bit nervous about this particular phase - transfer from IoS server to cloud. I have my main Siptah character - once upon a time transfered exile - waiting to move back to EL. Yesterday i was sorting and purging and reducing so right now my follower numbers have shrunken to 40… and i accidentally deleted every single hardened brick i own… 
But what i am worried about are my 2 skeletal warriors, 3 undead monstrocities and 3 wights (travelled with me to Siptah years ago). Will they pass a Green wall once again? Has anyone transfered creatures like those to EL successfully?
I transferred some of them but have not yet placed them in the world. On reflection I can’t be 100% sure they’re in the follower list as I haven’t looked for them specifically. After seeing this I was going to check and place one in the world to be sure but all American region servers are down atm.
I’ll poke at it after the servers are back if someone doesn’t beat me to it
So we were supposed to have everything packed up on our IoS characters already? I just logged back in a few days ago to try and build up an inventory of items as I lost everything years ago. Next thing I know, my #6107 IoS server is no longer available and almost everything I just gathered was still in storage. Did I just waste my time?
Transferred from 6103 to 1500, process went smooth at first. The server I went to is totally over populated with mega-structures. Lag is the name of the game there it seems. Additionally, it has 2 of the worst bugs, the inventory sorting problem and the german localization for most npcs names and items. So, I wanted to transfer off, but I cant now because every day my timer for transfer keeps resetting to another 24 hours of cooldown. All the other blocks are checked. Rather frustrated and want to get off the server to join my clan mates and rebuild.
So all the undead pets are in the follower list and I placed a wight with no issues. Should be fine I would think.
Yesss we did it!! Transfer was successful even the fact that i spawned into Vine Cellar (the very beginning of it) was pure luck as i went straight to Sep taverna to rest a little. 
All my followers are smugled into Sepermeru thanks to my big pockets.
Oh, my biggest thanks for info! Now i know i can spawn my skeletal friends safe! 
3rd IOS 6110 > 1520 Success - 49 followers or camels . Spawn location default desert
Sweet!
4th IOS 6437 >1521 Success- no followers or camels.
Spawn location-Volcano 2nd level. Promptly died due to heat and mobs while trying to make it out. tried to get body back from the desert to the volcano- took about 20 min to run it nude- promptly died due to heat.
All Gear is a write off.
I estimate 2 weeks and ill have all my gear back on this server.
No, Funcom doesnt get the blame.
LOL!