In that case it seems Windbot is unable to count the Quiver amount so you will have to use a timed persistent:
local nameAmmo = 'crystal arrow'
local containerAmmo = 'beach backpack'
local maxAmmoQuiver = 600
auto(30000, 60000)
if itemcount(nameAmmo, containerAmmo) >= 1
then
for i = 1, 4
do
moveitems(nameAmmo, 'lhand', containerAmmo, 100)
wait(300,500)
end
end
Every 30 to 60 sec it will try to move ammunition (try a few times) into the left hand (quiver location).
Untested*