Ανεβάζω τη φωτογραφία στο προφίλ μου και μετά γράφω ένα σχόλιο.

Yes. Ανεβάζω literally means I raise, I bring up, or I lift up. In modern Greek, it is also the normal verb for uploading something online.

So in this sentence:

• Ανεβάζω τη φωτογραφία = I upload the photo

This is a very common extension of the basic idea move something upward / put it up.

You may also hear it in other contexts:

• ανεβάζω μια φωτογραφία = upload/post a photo
• ανεβάζω ένα βίντεο = upload a video
• ανεβάζω κάτι στο Instagram = post/upload something on Instagram

Because τη φωτογραφία means the photo.

Greek uses the definite article very often, just like English uses the. Here:

• τη = the for a feminine noun in the accusative singular
• φωτογραφία = photo / photograph

So:

• τη φωτογραφία = the photo

The verb ανεβάζω takes a direct object, and that object appears in the accusative case. That is why the article is τη here.

Both τη and την can be correct.

The full form is την, but in modern Greek the final -ν is often dropped before certain consonants in everyday writing and speech.

So:

• τη φωτογραφία
• την φωτογραφία

Both mean the same thing: the photo.

You will often see τη before consonants like φ, π, κ, etc. The version without the final -ν is very common and natural.

Στο is a contraction of:

• σε = to / in / on / at
• το = the

So:

• σε το → στο

In this sentence:

• στο προφίλ μου = to/on my profile

Greek very often combines σε + article into one word:

• στο = σε + το
• στη = σε + τη
• στην = σε + την
• στους = σε + τους
• στις = σε + τις

Because Greek usually puts possessive pronouns like μου (my) after the noun.

So:

• το προφίλ μου = my profile
• literally: the profile my

This is normal Greek word order.

More examples:

• το σπίτι μου = my house
• η φίλη μου = my friend
• το όνομά μου = my name

So στο προφίλ μου means on my profile.

Greek normally keeps the article even when a possessive is present.

So Greek says:

• το προφίλ μου = literally the profile my

Not:

• μου προφίλ
• my profile in the English word order

This article + noun + possessive pattern is extremely common in Greek.

Examples:

• το βιβλίο μου = my book
• η μητέρα μου = my mother
• οι φίλοι μου = my friends

Yes, it could just use και, but μετά adds the idea of after that / then.

So:

• και = and
• μετά = after / afterwards / then
• και μετά = and then / and after that

In your sentence:

• Ανεβάζω τη φωτογραφία στο προφίλ μου και μετά γράφω ένα σχόλιο.
• I upload the photo to my profile and then I write a comment.

Without μετά, the sequence would be a little less explicit:

• ...και γράφω ένα σχόλιο = ...and I write a comment

With μετά, it clearly shows the second action happens next.

Both are possible, but they are slightly different in feel.

• γράφω ένα σχόλιο = I write a comment / one comment
• γράφω σχόλιο = I write a comment / I comment, more general or less specific

Here, ένα is the indefinite article a/an for a neuter noun in the accusative singular.

So:

• ένα σχόλιο = a comment

Using ένα sounds very natural when you mean a specific single comment.

Yes. Σχόλιο is a neuter noun.

That affects both the article and the form of the noun phrase:

• ένα = a/an for neuter singular
• το = the for neuter singular
• σχόλιο = comment

So:

• ένα σχόλιο = a comment
• το σχόλιο = the comment

For comparison:

• masculine: ένας φίλος = a friend
• feminine: μια φωτογραφία = a photo
• neuter: ένα σχόλιο = a comment

Yes, γράφω literally means I write. It is the normal verb to use for writing text, including online text.

So:

• γράφω ένα σχόλιο = I write a comment
• γράφω μήνυμα = I write a message
• γράφω email = I write an email

In many contexts, Greek uses γράφω where English might sometimes prefer post or leave, but write is still the basic meaning.

Both verbs are in the present tense, first person singular:

• ανεβάζω = I upload / I am uploading
• γράφω = I write / I am writing

In Greek, the present tense can often translate either:

• as a simple present (I upload)
• or a present continuous (I am uploading)

The exact English translation depends on context.

Here, because the sentence describes a sequence of actions, English will often sound more natural as:

• I upload the photo to my profile and then I write a comment or
• I’m uploading the photo to my profile and then writing a comment

If this is describing a routine, I upload ... and then I write ... works well.

Because this sentence is not using an infinitive. It has two full verbs:

• Ανεβάζω = I upload
• γράφω = I write

They are connected by και μετά = and then.

So the structure is:

• I upload ... and then I write ...

If Greek wanted something like to write, it would usually use a different construction, often with να:

• θέλω να γράψω ένα σχόλιο = I want to write a comment

But that is not what is happening here. Here we simply have two present-tense actions.

Greek word order is more flexible than English word order, because the articles and endings help show the role of each word.

The sentence as given is very natural:

• Ανεβάζω τη φωτογραφία στο προφίλ μου και μετά γράφω ένα σχόλιο.

But some parts could move for emphasis. For example:

• Στο προφίλ μου ανεβάζω τη φωτογραφία και μετά γράφω ένα σχόλιο.
  • This emphasizes on my profile
• Και μετά γράφω ένα σχόλιο.
  • This emphasizes the sequence and then

Still, the original version is the most straightforward and neutral.

A few useful points:

• Ανεβάζω is stressed on -βά-: a-ne-VA-zo
• φωτογραφία is stressed on the last -ί-: fo-to-gra-fi-A
• προφίλ is stressed on -φίλ
• γράφω is stressed on γρά-
• σχόλιο is stressed on σχό-

A few sound notes:

• φ sounds like English f
• γρ in γράφω is like a Greek g sound before r
• χ in σχόλιο is not like English ch; it is a harsher sound, somewhat like the h in Bach or the Scottish loch

The written accent marks are important because they show which syllable is stressed.