Hello,
Could anyone help me on this issue, Below is the powerapp which i am using to filter the gallery(documents) from the sharepoint library.
I have tried with many filter possibilites but it works either ways but i am looking for 2 sort of filters at a same time and also to download the multiple documents using checkbox. Before filtering user should be able to all the documents. Then as per filter the gallery should work.

1. Is it possible to filter the gallery by selecting values from the dropdown individually, For Ex: if i select training level and as a option "anything", i need to see or filter only training level documents which was defined in the sharepoint doc library and same way goes to all the dropdown Independent or as a one by one. Well i am using Distinct(Table,Column name) for the all the drop downs to fetch the values. The more the filter goes, the gallery should start with filter dynamically.
2. Second approch, If i set values to all the dropdowns according to the selection i need see the results in the gallery.
3. There is a displaymode set to the below 3 dropdowns, i have value in training level when i select "-" other two dropdowns will be invalid.
To Add on, For example:
4. This has to work like actual filter, When i select Training level "-" the result should pop up in gallery and show all documents which there under "-". And when actual filter applies to all the dropdowns it should provide the result.
5. And when i select Training level "-" and Application "Any Option" it should filter matching the variables and it should keep filtering accordingly. As many as filter if i apply it should provide the matching documents.
6. On Items for gallery, like i said it works either ways(since i am using "And"/"Or"). So it is either working for "And" otherwise "Or " Sort(Filter('Test Document',And(Training_x0020_Level=Dropdown1.Selected.Value,Application.Value=Dropdown2.Selected.Value,Package.Value=Dropdown3.Selected.Value,Language.Value=Dropdown4.Selected.Value,Medium.Value=Dropdown5.Selected.Value)),Modified,Descending). In my case it should work for both