Orange Mobile Internet - Impact of NAS-PC Transfers on 250GB Data Limit & Huawei B315 Bridge Mode

Good evening. Due to the move and the change of the internet to mobile, I have to apologize to something that I have not dealt with in x years - the limit of data sent / received. Orange and the 250 GB offer are at stake.
Therefore, question 1: I want to connect a NAS disk to the router. Do NAS - PC and other transfers in the local network also reduce transfer limits?
And question 2: the offered Huawei B315 modem has a bandwidth of up to 150Mb. I would like to have larger transfers between end devices and NAS than 150Mbps, so I would like to bet between Huawei and the UK router with ac mode support. The question is whether the B315 router can enable the bridge mode? Unfortunately, they do not know about the Orange helpline / chat ...

And where did the idea for Orange come from, if 25) GB may not be enough? Orange is expensive, the offer costs PLN 70 / month and PLN 15 / month for B315. PLN 85 / month in total It's a bad idea, and with B315 on top of that. This is first, secondly, to improve WiFi range and speed, you can use an additional AP connected to the LTE LAN-LAN router, not another router and bridge mode. I myself have such a network at home based on E5186 with Gigabit LAN ports, connected to it via LAN NAS and an additional AP with Gigabit and WiFi ports in AC. Addressing in the network is performed by E5186, connected stationary devices under AP and those with AC cards under WiFi. Router https://pl.aliexpress.com/store/product/TOTOL...-Band-Gigabit-Router/1967540_32701126467.html with DHCP turned off is placed as the AP. Of course, the local network does not diminish transfers. What's the location? you have to choose the optimal operator and offer, 99% it will not be Orange.