Hvis vedhæftningen ikke kommer frem, lægger jeg filen i en delt mappe i stedet.

Because Danish uses verb-second word order in main clauses.

The sentence starts with a subordinate clause:

Hvis vedhæftningen ikke kommer frem

After that, the main clause begins, and the finite verb must come before the subject:

lægger jeg filen i en delt mappe i stedet

So:

• neutral main clause: Jeg lægger filen i en delt mappe
• after a fronted element: Hvis ..., lægger jeg filen ...

This is very common in Danish:

• I morgen kommer jeg.
• Hvis det regner, bliver vi hjemme.

Because this part is a subordinate clause introduced by hvis.

In Danish, word order changes in subordinate clauses. A simplified pattern is:

subject + ikke/adverb + finite verb

So:

• vedhæftningen ikke kommer frem

Compare:

• main clause: Vedhæftningen kommer ikke frem.
• subordinate clause: Hvis vedhæftningen ikke kommer frem ...

That difference is very important in Danish.

Here kommer frem means something like gets through, shows up, or arrives properly.

Literally, komme frem can mean come forward, arrive, or appear, but in this context it is used idiomatically about an attachment not reaching the other person or not appearing on their end.

So in email/file-sharing context, vedhæftningen ikke kommer frem means the attachment does not successfully arrive or show up.

Danish very often uses the present tense to talk about the future, especially when the future meaning is clear from the context.

So:

lægger jeg filen i en delt mappe i stedet

can naturally mean:

• I put the file in a shared folder instead
• or, more naturally in English here, I’ll put the file in a shared folder instead

English often prefers will, but Danish does not need a separate future form here.

Vedhæftning means attachment.

The ending -en is the definite article attached to the noun, so:

• en vedhæftning = an attachment
• vedhæftningen = the attachment

Danish usually puts the definite article at the end of the noun instead of using a separate word like English the.

The same thing happens with:

• en fil → filen
• en mappe → mappen

Because one noun is definite and the other is indefinite.

• filen = the file
• en delt mappe = a shared folder

So the speaker is talking about:

• a specific file: filen
• but not necessarily a specific previously mentioned folder: en delt mappe

This is completely normal Danish noun usage.

I stedet means instead.

It usually goes toward the end of the clause, as it does here:

lægger jeg filen i en delt mappe i stedet

That placement sounds natural in Danish. English also often puts instead near the end:

• I’ll put the file in a shared folder instead

You may also see i stedet for ..., which means instead of ...:

• i stedet for at sende den = instead of sending it

Delt is the normal adjective form here in indefinite singular.

So:

• en delt mappe = a shared folder
• et delt dokument = a shared document
• delte mapper = shared folders

The -e form is used in plural and some other contexts, but not here.

In this sentence, mappe is singular and indefinite, so delt is correct.

Yes, in standard Danish writing, a subordinate clause like this is separated from the main clause with a comma:

Hvis vedhæftningen ikke kommer frem, lægger jeg filen ...

So the comma marks the boundary between:

• the condition: Hvis vedhæftningen ikke kommer frem
• the main clause/result: lægger jeg filen ...

Comma usage in Danish is more systematic than in English in this type of sentence.

Yes, hvis means if and introduces a condition.

So the structure is:

• Hvis X, Y
• If X, Y

In this sentence, the condition is:

• Hvis vedhæftningen ikke kommer frem = if the attachment doesn’t get through

and the result is:

• lægger jeg filen i en delt mappe i stedet

Yes, that is possible, but it is slightly different in emphasis and rhythm.

You can say:

• Hvis vedhæftningen ikke kommer frem ...
• Hvis ikke vedhæftningen kommer frem ...

The version in your sentence is the more straightforward, neutral one. For a learner, it is the safest pattern to copy.

So if you are building similar sentences, this is a very good model:

• Hvis filen ikke virker, sender jeg den igen.
• Hvis linket ikke virker, laver jeg et nyt.

Yes. Mappe is the standard Danish word for both a physical folder and a computer folder, depending on context.

So in IT contexts:

• en mappe = a folder
• en delt mappe = a shared folder

That is completely natural Danish.

Yes. Vedhæftning is a general word for an attachment, so it works well in email and in many digital contexts.

The phrase ikke kommer frem is also broad enough to work when something fails to arrive, show up, or be delivered properly.

So the sentence sounds natural in everyday professional communication, especially when talking about sending files digitally.