from aiogram.dispatcher.filters.state import StatesGroup, State
@dp.callback_query_handler(lambda callback_query: callback_query.data.startswith('LoadYoutube_'), state='*')
async def LoadYoutube_callback(tg: types.CallbackQuery, state: FSMContext):
async with state.proxy() as data:
data = 'text'
async with state.proxy() as data:
text = data
print(text)