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Есть несколько руководств о том, как использовать UIMenuController inside UICollectionView , но в iOS 14 это не рекомендуется:

 // These methods provide support for copy/paste actions on cells.
// All three should be implemented if any are.
- (BOOL)collectionView:(UICollectionView *)collectionView shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath API_DEPRECATED_WITH_REPLACEMENT("collectionView:contextMenuConfigurationForItemAtIndexPath:", ios(6.0, 13.0));
- (BOOL)collectionView:(UICollectionView *)collectionView canPerformAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(nullable id)sender API_DEPRECATED_WITH_REPLACEMENT("collectionView:contextMenuConfigurationForItemAtIndexPath:", ios(6.0, 13.0));
- (void)collectionView:(UICollectionView *)collectionView performAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(nullable id)sender API_DEPRECATED_WITH_REPLACEMENT("collectionView:contextMenuConfigurationForItemAtIndexPath:", ios(6.0, 13.0));
 

В то же время UIMenuController все еще существует в iOS 14. Как теперь использовать его для ячеек?

UICollectionViewDelegate не будет запускать те методы, которые вы публикуете после iOS 14. Но мы все еще можем получить firstResponder, который нужен UIMenuController из UIView. Хиты. UICollectionView по-прежнему является UIView

Полный код:

 protocol Menuable {
    func menuAction(_ sender: Any?)
}

class CustomCell: UICollectionViewCell, Menuable {
...
    func menuAction(_ sender: Any?){...}
...
}

class MenuableCollectionView: UICollectionView {
    var selectedIndexPath: IndexPath?
    
    func setupLongpress() {
        let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPressGesture(_:)))
        self.addGestureRecognizer(longPressGesture)
    }

    func setupMenu() {
        let menuItem = UIMenuItem(title: "action", action: #selector(menuAction(_:)))
        UIMenuController.shared.menuItems = [menuItem]
        UIMenuController.shared.update()
    } 
    
    @objc func handleLongPressGesture(_ sender: UILongPressGestureRecognizer) {
        let point = sender.location(in: self)
        if sender.state == .began {
            guard let indexPath = indexPathForItem(at: point) else {
                return
            }
            
            selectedIndexPath = indexPath
            becomeFirstResponder()
            
            let cell = cellForItem(at: indexPath)
            
            let x: CGFloat = cell?.frame.midX ?? point.x
            let y: CGFloat = 10
            
            let rect = CGRect(x: x, y: y, width: 10, height: 10)
            if #available(iOS 13.0, *) {
                UIMenuController.shared.showMenu(from: self, rect: rect)
            } else {
                UIMenuController.shared.setTargetRect(rect, in: self)
                UIMenuController.shared.setMenuVisible(true, animated: true)
            }
        }
    }
    
    @objc func menuAction(_ sender: Any?) {
        guard let indexPath = selectedIndexPath else {
            return
        }
        let cell = cellForItem(at: indexPath) as? Menuable
        cell?.menuAction(sender)
    }
    
    override var canBecomeFirstResponder: Bool {
        return true
    }
    
    override open func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
        if action == #selector(menuAction(_:)) {
            return true
        } else {
            return false
        }
    }
}

// you should call setupLongpress() and setupMenu() after collection view init.