tukue no ue no fairu ni tizu wo hasande, ato de mirareru you ni simasita.

This is a very common Japanese noun-linking pattern.

• 机 = desk
• 机の上 = the top of the desk, or on the desk
• 机の上のファイル = the file on the desk

So each の connects one noun to another:

• 机の上 = the desk’s top
• 机の上のファイル = the file that is on the desk

In natural English, you would not translate each の separately. You just read the whole phrase as the file on the desk.

Because ファイル is the place or target where the map is being put.

In this sentence:

• 地図を = the map is the thing being acted on
• ファイルに = the file is where it is being inserted

The verb 挟む here means something like to insert, to tuck into, or to sandwich between things. So the map is the object, and the file is the destination/container-like target.

A rough pattern is:

• 場所・相手 に
• 物 を
• 挟む

So: ファイルに地図を挟む = put/tuck the map into the file

挟んで is the て-form of 挟む.

The basic meaning of 挟む is to pinch, to hold between, or to put something between things. In this sentence, it does not mean physically pinching with your fingers. It means something more like:

• tuck in
• insert
• sandwich into
• slip into a file or between papers

So 地図を挟んで means having tucked the map into the file or I put the map into the file and...

Here, the て-form links one action to the next.

So the sentence flows like this:

1. I tucked the map into the file
2. and then I made it so it could be seen later

In English, we often use and, after, or just a comma. In Japanese, the て-form is a very common way to connect actions.

So 挟んで、あとで見られるようにしました means something like:

• I tucked the map into the file so that it could be looked at later
• I put the map into the file and made it easy to look at later

あとで means later or afterward.

Here it tells you the time of the later action:

• あとで見られる = can look at it later / can be seen later

It does not mean after doing X immediately in a strict technical sense. It is just a natural way to say later on.

Grammatically, 見られる can be either:

• passive: is seen
• potential: can see / can be seen

But in this sentence, it is best understood as potential.

Why?

Because ようにする often expresses making arrangements so that something becomes possible or easier:

• 見られるようにする = make it so that it can be seen/looked at

So the meaning is not really so that it would be seen by someone. It is more like:

• so that I could look at it later
• so that it would be available to look at later

In English, we often make the hidden subject explicit, but Japanese often leaves it unsaid.

Because ようにする and ために are used differently.

ために is often used when the purpose clause contains a verb that expresses an intentional action:

• 忘れないためにメモした = I made a note so that I would not forget

But ように is commonly used when the purpose/result involves:

• ability
• possibility
• states
• automatic outcomes
• non-volitional expressions

Since 見られる is a potential form, ように is the natural choice:

• あとで見られるようにしました = I made it so that it could be looked at later

This has the nuance of arranging things deliberately.

ようにしました means I made it so that..., I arranged it so that..., or I took steps so that...

It shows deliberate effort by the speaker.

So the nuance is not just:

• I put the map in the file

It is more specifically:

• I put the map in the file with the intention of making it easy to look at later
• I arranged things so it could be seen later

This is a very useful pattern:

• V-dictionary / V-potential / V-negative + ようにする
• meaning: make an effort / arrange things so that...

The sentence does not explicitly say.

That is very normal in Japanese. The subject is often omitted if it is clear from context.

Depending on the situation, it could mean:

• so I could look at it later
• so we could look at it later
• so someone could look at it later

In many everyday contexts, listeners would naturally assume the speaker means I unless the wider conversation suggests someone else.

Most naturally, it is the map.

Even though 地図 is not repeated before 見られる, Japanese often omits things that are already understood from context.

So the idea is:

• I tucked the map into the file so that I could look at the map later

Not usually:

• so that I could look at the file later

The file is just where the map was placed.

Because 挟む gives a more specific image.

• 入れる = put in
• 挟む = insert between things, tuck in, sandwich

With a file, folder, or stack of papers, 挟む suggests placing the map between pages or inside in a tucked-away way. It sounds more natural if the map is being slipped into papers rather than simply dropped into a container.

So 挟む adds a physical nuance:

• not just put in
• but slip/tuck into the file between papers

Because the speaker is politely describing a completed action.

• しました = polite past
• plain form would be した

So:

• 見られるようにしました = polite
• 見られるようにした = casual/plain

The past tense is used because the arranging action has already been done. The speaker is saying they already took care of it.

Yes. The overall structure is:

• ファイルに地図を挟んで = tuck the map into the file
• あとで見られるようにしました = made it so it could be looked at later

So the first action was done for the sake of the second goal.

A very natural English interpretation is:

• I tucked the map into the file on the desk so I could look at it later.
• I put the map into the file on the desk so it would be easy to find and look at later.

So yes, the sentence expresses both:

1. the action taken
2. the purpose or intended result of that action