1. I'd like you to get my permission next time.
2. I'd like you to ask my permission next time.
3. I'd like you to ask for my permission next time before uploading my photos.
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Are the sentences grammatical?
All are fine, yes.
Yes, all three sentences are grammatically correct. They convey slightly different meanings, depending on the level of politeness and the specific action being requested.
1. "I'd like you to get my permission next time." This sentence implies that you want the person to actively take steps to obtain your permission without necessarily specifying how they should do it. It suggests that you expect the person to proactively seek your permission in the future.
2. "I'd like you to ask my permission next time." This sentence explicitly asks the person to verbally seek your permission before taking any action. It emphasizes the importance of their act of asking for permission and implies that any assumptions or presumptions should be avoided.
3. "I'd like you to ask for my permission next time before uploading my photos." This sentence is more specific and adds the information that you specifically want the person to ask for permission before uploading your photos. It indicates that you have a preference regarding the action being taken, and emphasizes that permission should be sought specifically for this action.