Get metadata of file present on dropbox before downloading in iphone - objective-c

I am using Dropbox Api to display the list of files and folders present on it.. User can download file and view it..
I am downloading file every time .. but now i want to download file only if it is modified..
I can get date when file was updated in its metadata LastModifiedDate..
I have displayed all files in tableview and at the time of display all files i am getting metadata of all files in following function i have mentioned. And if after displaying all list any file get change I will not get latest file..I am getting the latest LastModifiedDate after file gets download..
Following method gets called when file download is complete:
- restClient:loadedMetadata:
Is there any way by which i can get it before it starts downloading? Is there any method of dropbox api which gives metadata of file before download?
If anybody wants further explanation then please let me know..
Thanks :)

Caching policies should be your friends, as far as the server is configured to support ETag.
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I don't mean versionned files, I mean attached files: binaries and other types of files that have been attached to issues, merge requests, etc.
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I had the same question and after getting in touch with gitlab support they confirmed that this is not currently implemented (as of now, November 2021), and forwarded me the 3 following feature requests :
API list all files on a project : https://gitlab.com/gitlab-org/gitlab/-/issues/197361
Attachment Manager : https://gitlab.com/gitlab-org/gitlab/-/issues/16229
Retrieve uploaded files using API : https://gitlab.com/gitlab-org/gitlab/-/issues/25838
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So if you are uploading via the dropbox (which doesn't return the quickkey associated with the file), you CAN NEVER dropbox upload and then use the api to find the file and download it. This renders their API as useless as tits on a boar hog.
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