Limit on free Apex Packs (forced to pay for loot boxes)

I got that twitch prime deal today, and when i opened those 5 packs i got pink (epic) crafting material and it gave me 200 materials, when i opened it i thought i could finally craft legendary skin for a legend/ character i actually play with, as i have been saving all the materials ive gotten since i started playing wich amounted to almost 800, but it only gave me those 200,even tho i got 400 materials earlier from epic materials, how much is it supposed to give you?