Can't write to networked mac

This doesn't really have anything to do with Yosemite, I had this problem before, I just hadn't done anything about it yet. I have all of my settings on my Mac Pro "sharing" preferences set so that I have reading and writing access to all my drives. I have no problems for an entire day and then all of a sudden, it will tell me that I can't save a Photoshop file that I'm editing on my laptop because the file is on the Mac Pro and I don't have write access. Is there somewhere other than the "sharing" folder that I need to go to and change some preferences of some kind? Thanks in advance.

G'day Sandra,
Kenichi is on the money with this one.
On each Mac, your username is allocated to a numeric user id starting with number 501 for the first user you create on that computer. The second account your create is user 502 and so on. This user id determines the access permissions to every file.
Thus, you could have an account on your iMac named sandra (with user id 501), and an account on your MacBook named sandra (with user id 502, because another account was created first). When you share files, even though you have the same username, you are NOT the same owner from the files perspective, and thus you do not have full permissions over the file!
To get around this from your MacBook, you need to use the "connect as" option for your iMac. Then you enter your iMacs account username and password (and save it). You will then have full access to the files on that computer - although you will still get access errors when you copy them from your iMac to your MacBook.
To fix this, you simply "Get Info" on the file, and give yourself read/write permission.
Or.. if you have the time and patience.. and don't want to go through the hassle every time you copy a file... you can set things up so that every account on every computer is created in the same order, with the same username and password.....
(There are other ways to fix this - using Access Control Lists - but I will leave it at that for now).
Cheers,
Rodney

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