بما ان المستندات الداعمة في الملف، مسؤول المطالبات هيبدا المعاينة.

It means since, as, or given that. It introduces the reason for what follows.

So the structure is:

بما ان + reason, result

In careful spelling, you will often see it as بما إن. In informal writing, people may write ان instead of إن.

It is best described as a mix, which is very common in professional or administrative contexts in Egypt.

Why it feels mixed:

• هيبدا is clearly Egyptian Arabic, because the prefix هـ marks the future.
• Words like المستندات, الداعمة, مسؤول المطالبات, and المعاينة are formal and close to Modern Standard Arabic.

This kind of blend is normal in workplaces, customer service, insurance, banking, and official communication.

Because in Arabic, the verb to be is usually omitted in the present tense.

So:

المستندات الداعمة في الملف

literally looks like:

the supporting documents in the file

but it means:

the supporting documents are in the file

This is completely normal Arabic grammar. The idea of are is understood without saying it.

Because المستندات is a non-human plural, and in Arabic, non-human plurals often take feminine singular agreement.

So even though المستندات means documents and is plural, the adjective is:

الداعمة = singular feminine

not a regular plural adjective.

This is a very common pattern in Arabic:

• الكتب الجديدة = the new books
• المستندات الداعمة = the supporting documents

So this agreement may look strange to an English speaker, but it is normal.

Literally, it means in the file.

Depending on context, الملف could mean:

• a physical file
• a case file
• a customer record
• a digital file or folder

In business or insurance language, it often means something like on file, in the case file, or in the record.

It means something like claims officer, claims representative, or claims handler, depending on the company or situation.

The phrase is an idafa structure, which is a noun-noun construction:

• مسؤول = officer / person responsible
• المطالبات = claims

So literally it is:

the person responsible for claims

In context, a smoother English equivalent is usually claims officer or claims specialist.

هيبدا means he will start or he is going to start.

In Egyptian Arabic, the prefix هـ is commonly used to mark the future.

So:

• يبدأ = he starts / he begins
• هيبدأ or هيبدا = he will start / he will begin

Here it refers to مسؤول المطالبات, which is singular masculine, so he will start fits the grammar.

In careful spelling, many people would write:

هيبدأ

But in informal writing, the hamza is often omitted, so you may see:

هيبدا

Both represent the same word.

A common pronunciation is approximately:

hayibda or hayebda

At the end, there is still a glottal stop in careful pronunciation because the underlying verb is بدأ.

المعاينة is a formal word meaning something like:

• inspection
• examination
• assessment
• review
• sometimes site inspection

The exact English choice depends on the situation. In an insurance or claims context, it often refers to the inspection or assessment step in the claim process.

So هيبدا المعاينة means the claims officer will begin the inspection or assessment.

Because it refers to a specific, known procedure: the inspection.

In administrative Arabic, it is very common to use the definite form when both sides know which process is being discussed.

So:

• المعاينة = the inspection / the assessment

This sounds natural in procedural language.

A cleaner Egyptian-style spelling would be:

بما إن المستندات الداعمة في الملف، مسؤول المطالبات هيبدأ المعاينة.

A more fully Modern Standard Arabic version might be:

بما أن المستندات الداعمة موجودة في الملف، سيبدأ مسؤول المطالبات المعاينة.

Notice the differences:

• بما إن / بما أن for spelling/register
• هيبدأ is Egyptian future
• سيبدأ is Standard Arabic future
• موجودة can be added in Standard Arabic to make the sentence feel more explicit

All of these versions are very close in meaning.