Paul a supprimé la mauvaise photo, puis il a téléchargé la bonne.

These are both in the passé composé, one of the most common French past tenses.

It is formed with:

• avoir (or sometimes être) in the present tense
• • a past participle

So:

• a supprimé = has deleted / deleted
• a téléchargé = has uploaded/downloaded depending on context, but here the meaning is already given

In everyday French, the passé composé is the normal way to talk about a completed action in the past.

So:

• Paul a supprimé... = Paul deleted...
• puis il a téléchargé... = then he uploaded/downloaded...

Because they describe photo, and photo is a feminine noun in French.

So the article and adjective must agree with it:

• la photo
• la mauvaise photo
• la bonne photo

That is why you get:

• la instead of le
• mauvaise instead of mauvais
• bonne instead of bon

Even though photo ends in -o, it is feminine because it is short for photographie.

French often leaves out a noun when it is already obvious from the context.

So:

• la mauvaise photo = the wrong/bad photo
• la bonne = the right/good one

Here, la bonne means the good/right photo, with photo understood.

English does the same thing:

• He deleted the bad photo, then uploaded the good one.

So la bonne is a very natural way to avoid repeating photo.

In this sentence, bonne most naturally means the right/correct one, not just morally good or high quality.

Likewise, la mauvaise photo often means the wrong photo rather than simply a bad-quality photo.

So the contrast is:

• la mauvaise photo = the wrong one
• la bonne = the right one

French often uses bon / bonne and mauvais / mauvaise this way.

Puis means then, next, or after that.

It shows that one action happened after the other:

• first, Paul deleted the wrong photo
• then, he uploaded the right one

Compared with similar words:

• et = and
• puis = then/and then
• ensuite = afterward/then

Puis is very common and often sounds a little more orderly or narrative than plain et.

So:

• Paul a supprimé la mauvaise photo, puis il a téléchargé la bonne.

  clearly presents two actions in sequence.

Because in French, a finite verb normally needs an explicit subject.

So after puis, you usually say:

• puis il a téléchargé...

not just:

• puis a téléchargé...

French does not drop the subject the way some languages do.

Also, repeating il makes the sentence flow naturally:

• Paul a supprimé..., puis il a téléchargé...

In English, we could also say then he uploaded..., so this is not very different in meaning, but in French the subject pronoun is basically required.

Because these past participles are used with avoir, and with avoir the past participle usually does not agree with the direct object if that object comes after the verb.

Here:

• a supprimé la mauvaise photo
• a téléchargé la bonne

The objects come after the verb, so the participles stay the same:

• supprimé
• téléchargé

If the direct object came before the verb, agreement could happen. For example:

• La photo qu’il a supprimée
• La photo qu’il a téléchargée

There, supprimée and téléchargée agree with photo, which is feminine singular.

Yes. Supprimer is a very common verb for delete, especially in digital contexts.

For example:

• supprimer un fichier = delete a file
• supprimer une photo = delete a photo
• supprimer un message = delete a message

A related verb is effacer, which can also mean erase/delete, but supprimer is extremely common for removing digital items.

So a supprimé la mauvaise photo is a very natural phrase.

That is a very common question.

Traditionally, télécharger is often used for download. However, in real usage, many speakers also use it more broadly in tech contexts, and context becomes important.

More precise alternatives are:

• télécharger = often download
• téléverser = upload in more careful or Canadian French
• mettre en ligne = put online / upload
• envoyer = send

So if the meaning shown to you is uploaded, just know that real-world usage is not always perfectly strict, and French tech vocabulary can vary by region and by speaker.