Create a table on a filegroup other than the default

You can easily check with this sql query:

SELECT o.[name], o.[type], i.[name], i.[index_id], f.[name]
FROM sys.indexes i
INNER JOIN sys.filegroups f
ON i.data_space_id = f.data_space_id
INNER JOIN sys.all_objects o
ON i.[object_id] = o.[object_id]
WHERE i.data_space_id = f.data_space_id
AND o.type = 'U' -- User Created Tables
GO

Just add:

AND f.name = ArchiveFileGroup

to see everything in your new filegroup or:

AND o.name = acr_myTable

to see where your table is located.

If you never added a file to your filegroup, then I would expect an error but you didn't include either an error message or anything saying you did create a file. If you did not, I suggest starting at the microsoft documentation if needed.

The OP found the this helpful trying to create a new file in his filegroup.

You can use sys.filegroups to see all the created file groups in your server like

SELECT *
FROM sys.filegroups

See here for more information List All Objects Created on All Filegroups