Can not Change Delivery Quantity amount from sales invoice

Question

I recently watched a video of Odoo
https://www.youtube.com/watch?v=RDnrOIDIi0w&ab_channel=PinkyShah [1]
where I saw, milestone product delivery quantity change . I do same as video instruct but at final invoice I can not change delivery quantity. it fixed to 0.
My product
Image [2]
My  sales order
Image [3]
My Time Sheets
Image [4]
now when I go for creating an invoice,
Image [5]
Milestone products not including in invoices also cannot  change delivered quantity from sales order according to the

Rafiur Rahman Rafit · Answer

image [1]
I enable Milestone from Project Settings, Then Add Milestone from task
image [2]
image [3]

Sales Order:
image [4]
another ORder is
image [5]
but what about based on the delivery order quantity product, I cannot change it from that sales order.

[1] /web/image/64697538-e899c25f/image.png?access_token=83910330-c77b-4217-a903-01dba1b87218
[2] /web/image/64697540-3538b848/image.png?access_token=a3236f89-dffe-466c-890d-43ba0299eca0
[3] /web/image/64697539-512bbdb6/image.png?access_token=d

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