Cant delete files from windows file explorer, or delete dataset..

[SomeDumbNAS]

hello, first post! new to Truenas (or any NAS for that matter). When looking at files on my PC I was trying to clear some out from just testing my setup. 1 file will not delete. I tried to delete the dataset also cant do it. Tried to disconnect/destroy and cant do it. this is what I am getting from truenas when trying to delete the data set.

Code:

Error: concurrent.futures.process._RemoteTraceback:
"""
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/zfs.py", line 139, in do_delete
    zfs.destroy(name, force=options['force'])
  File "libzfs.pyx", line 391, in libzfs.ZFS.__exit__
  File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/zfs.py", line 139, in do_delete
    zfs.destroy(name, force=options['force'])
  File "libzfs.pyx", line 1330, in libzfs.ZFS.destroy
libzfs.ZFSException: unmount failed

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/concurrent/futures/process.py", line 243, in _process_worker
    r = call_item.fn(*call_item.args, **call_item.kwargs)
  File "/usr/local/lib/python3.9/site-packages/middlewared/worker.py", line 94, in main_worker
    res = MIDDLEWARE._run(*call_args)
  File "/usr/local/lib/python3.9/site-packages/middlewared/worker.py", line 45, in _run
    return self._call(name, serviceobj, methodobj, args, job=job)
  File "/usr/local/lib/python3.9/site-packages/middlewared/worker.py", line 39, in _call
    return methodobj(*params)
  File "/usr/local/lib/python3.9/site-packages/middlewared/worker.py", line 39, in _call
    return methodobj(*params)
  File "/usr/local/lib/python3.9/site-packages/middlewared/schema.py", line 977, in nf
    return f(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/zfs.py", line 144, in do_delete
    raise CallError(str(e), errno_)
middlewared.service_exception.CallError: [EBUSY] unmount failed
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 367, in run
    await self.future
  File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 403, in __run_body
    rv = await self.method(*([self] + args))
  File "/usr/local/lib/python3.9/site-packages/middlewared/schema.py", line 973, in nf
    return await f(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/pool.py", line 1589, in export
    await self.middleware.call('zfs.pool.delete', pool['name'])
  File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1248, in call
    return await self._call(
  File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1205, in _call
    return await methodobj(*prepared_call.args)
  File "/usr/local/lib/python3.9/site-packages/middlewared/service.py", line 506, in delete
    rv = await self.middleware._call(
  File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1213, in _call
    return await self._call_worker(name, *prepared_call.args)
  File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1219, in _call_worker
    return await self.run_in_proc(main_worker, name, args, job)
  File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1146, in run_in_proc
    return await self.run_in_executor(self.__procpool, method, *args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1120, in run_in_executor
    return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs))
middlewared.service_exception.CallError: [EBUSY] unmount failed

When trying to right-click delete on windows I get a popup that says I don't have permission. After trying once on Truenas to destroy the pool I tried one more time and it allowed it. I was wanting to know if anybody knew what was holding me up possibly. Ty in advance I'm just trying to learn how it all works. The hardest part for me is configuring permissions :(