when was Nepal a part of Tibet?

I was under the impression from talking to both Nepalese and Tibetan People that the borders often changed between Tibet and Nepal and that Tibet once was over most of Nepal. I'm not sure the AI fully answered my question because it looks like it is only talking about the 1800s through the present whereas I was interested in going all the way back to when Padmasambhava (the Mahasiddha) took Buddhism to Tibet from Nalanda Buddhist University in Bihar to King Trisong Detsun since King Trisong Detsun was born in 742 I was wondering how the borders between Nepal and Tibet had changed the last almost 1500 years or so but this doesn't answer that question that far back.

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Nepal was never a part of Tibet in a formal or political sense; however, there were periods of interaction and conflict between the two regions, including a war in 1855-1856. 

Here's a more detailed explanation:

• No Formal Subjugation:

  Nepal, as a distinct kingdom, never became a territory under Tibetan control or vice versa. 

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• Nepal - Wikipedia

  The country was never colonised but served as a buffer state between Imperial China and British India.

  

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Buffer State:

Nepal historically served as a buffer state between Imperial China (which controlled Tibet) and British India. 

Interaction and Conflict:

There were periods of interaction and conflict between Nepal and Tibet, including the Nepal-Tibet War of 1855-1856. 

Tribute Relations:

Tibet, under Qing Dynasty control, maintained a tribute relationship with both Nepal and China. 

Nepal's Pro-British Policy:

In the mid-19th century, Nepal, under the leadership of Jung Bahadur, adopted a pro-British policy and even invaded Tibet in 1855, taking advantage of the Taiping uprising in China, gaining privileges there. 

Modern Nepal's Formation:

Modern Nepal was formed in the late 18th century by the expansion of the Gorkha Kingdom, which united several independent hill states. 

Sino-Nepalese War:

Nepal and China fought a war (Sino-Nepalese War) in 1792, which resulted in Nepal gaining some privileges in Tibet. 

Tibet's Status:

Tibet was a de facto independent state from the collapse of the Qing dynasty in 1912 until its annexation by the People's Republic of China in 1951. 

Sino-Nepalese War - Wikipedia

Tibet became a tribute state under Qing (Tibet maintains diplomacy and pays tribute). Tibet paid tribute to Nepal in 1792, 1794, 1...

Wikipedia

China - Tibet, Nepal, Himalayas | Britannica

Qing control of Tibet reached its height in 1792, but thereafter China became unable to protect that region from foreign invasion.

Britannica