Learn Hardcore Korean: sajin·dongyeongsangeul hyudaepone jeojanghaeyo.

With coordinated nouns, you usually attach the case particle only once, to the last item. So 사진·동영상을 is standard. Writing 사진을 동영상을 is unnatural. With a spoken “and,” it’s the same: 사진과 동영상을 저장해요.

Can I drop -을/를 here?

You often can drop object markers, but here omitting it can look like three nouns in a row. Safer choices:

Keep it: 사진·동영상을 휴대폰에 저장해요.
Use a conjunction: 사진과 동영상 저장해요.
Topicalize: 사진·동영상은 휴대폰에 저장해요. In casual speech, prosody helps, so 사진하고 동영상 저장해요 can sound fine.

What is 에 doing here? Why not 에서?

에 marks the target/destination (“to/in the phone”). 에서 marks where an action happens or the source.

휴대폰에 저장해요 = save to the phone.
휴대폰에서 저장해요 = doing the saving on the phone (place of action) or saving from the phone; it’s ambiguous. To say “from A to B,” use both: 휴대폰에서 PC로 사진을 옮겨요.

Where is the subject? How do I say “I” or “you”?

Korean often drops the subject when context is clear. To be explicit:

저는/제가 사진·동영상을 휴대폰에 저장해요. (I)
너는/네가 is casual “you” for close friends; otherwise use names/titles. 당신 is rare outside special contexts.

What politeness/tense is 저장해요? How do I change it?

Neutral polite present: 저장해요
Past: 저장했어요
Future: 저장할 거예요
Formal polite: 저장합니다 / 저장했습니다 / 저장하겠습니다
Casual: 저장해 / 저장했어 / 저장할 거야
Request: 저장해 주세요 / 저장하세요
Promise/offer: 저장할게요
Question: 저장해요?

How do I say “Photos and videos get saved to the phone (automatically)”?

Use the passive: 저장되다 → 저장돼요/저장됩니다.

사진·동영상이 휴대폰에 자동으로 저장돼요. Note the subject marker 이/가 on the files.

Can I use 에다가 as in 휴대폰에다가 저장해요?

Yes. 에다가 adds emphasis to the destination (“right onto/into the phone”) and sounds a bit more colloquial. Neutral: 휴대폰에 저장해요. To say “only to the phone,” use 휴대폰에만 저장해요.

Which word is best: 휴대폰, 핸드폰, 스마트폰, or 휴대전화?

휴대폰: very common and natural.
휴대전화: more formal/standard in writing.
핸드폰: colloquial; widely used in speech.
스마트폰: specifically a smartphone. Casual 폰 is also common.

Is 동영상 the same as 영상?

동영상 = a video clip/file (moving image). Common in app menus with 사진.
영상 = visuals/video in a broader sense (e.g., 영상 통화, 홍보 영상). In many contexts 영상 means “video,” but UI strings often say 사진·동영상.

How do I say it’s on my phone specifically?

Add a possessive:

Polite: 제 휴대폰에
Casual: 내 휴대폰에 Example: 사진·동영상을 제 휴대폰에 저장해요.

Why no plural markers like 사진들/동영상들?

Korean usually leaves plural unmarked when it’s obvious. 사진·동영상 already implies plural. Use -들 only for emphasis or clarity: 사진들이 휴대폰에 있어요.

Can I move the location earlier in the sentence?

Yes. Both are natural:

휴대폰에 사진·동영상을 저장해요.
사진·동영상을 휴대폰에 저장해요. Major elements can move before the verb for flow or emphasis; the verb stays at the end.

How do I make a polite request/command using this wording?

Polite request: 사진·동영상을 휴대폰에 저장해 주세요.
Polite instruction: 사진·동영상을 휴대폰에 저장하세요.

Any quick pronunciation tips?

사진 sounds like “sajin.”
휴대폰에 often flows as “휴대포네” in speech.
저장해요 keeps the ㅎ clear: “jeojang-haeyo.” Clarity and rhythm matter more than exact romanization.

Can I topicalize it: 사진·동영상은 휴대폰에 저장해요? What changes?

Yes. 은/는 makes “photos and videos” the topic, adding contrast: “As for photos and videos, (I) save them to the phone,” implying other items might be handled differently.

When would I use 옮기다, 복사하다, 백업하다, or 다운로드하다 instead of 저장하다?

저장하다: save/store (e.g., from an app to storage).
옮기다: move/transfer. 사진을 휴대폰으로 옮겨요.
복사하다: copy. 사진을 휴대폰에 복사해요.
백업하다: back up. 사진을 클라우드에 백업해요.
다운로드하다: download. 동영상을 휴대폰에 다운로드해요.

What’s the nuance of 저장해 두다/저장해 놓다 compared to plain 저장해요?

-아/어 두다/놓다 adds the idea of doing it in advance and leaving it that way for later. Example: 중요한 사진은 휴대폰에 저장해 둬요.