Issue When too many open files

Question

`I have multiple input root files (150 files)from different directories, and I intend to incorporate all of them into my code. However, when I run the code, it seems to only process the last file, even though I have tested it with just two files. Strangely, I'm not encountering any error messages.

Additionally, I'm facing another issue. When I open a new TBrowser, I find that I can't access my histograms. Below is a section of my code (header file)for reference:`

class inclphoton {
public:
    TTree *fChain;
    Int_t fCurrent;

    vector<float> *ttdata_presel_photonPt;

    TBranch *b_ttdata_presel_photonPt;
    std::vector<std::string> files;
    inclphoton(TTree *tree = nullptr);
    virtual ~inclphoton();
    virtual Int_t Cut(Long64_t entry);
    virtual Int_t GetEntry(Long64_t entry);
    virtual Long64_t LoadTree(Long64_t entry);
    virtual void Init(TTree *tree);
    virtual void Loop();
    virtual Bool_t Notify();
    virtual void Show(Long64_t entry = -1);
};

#endif
#ifdef inclphoton_cxx
inclphoton::inclphoton(TTree *tree) : fChain(0)
{
    TH1::AddDirectory(kFALSE);
files.push_back("/userdata/incPhoton/data15/user.data15periodd.n181.periodD.DAOD_STDM2.grp23_v01_p3984_ANALYSIS_ntuples/user.26552633._000001.ANALYSIS.root");
files.push_back("/userdata/incPhoton/data15/user..data15periodd.n181.periodD.DAOD_STDM2.grp23_v01_p3984_ANALYSIS_ntuples/user.26552633._000002.ANALYSIS.root");
//files.push_back("/userdata/incPhoton/data15/user..data15periodd.n181.periodD.DAOD_STDM2.grp23_v01_p3984_ANALYSIS_ntuples/user.26552633._000003.ANALYSIS.root");
    if (!tree) {
        TFile *f;
 
        for (const auto& fileName : files) {
           std::cout << "Processing file: " << fileName << std::endl;
           f = TFile::Open(fileName.c_str());
            if (!f || !f->IsOpen()) {
                std::cerr << "Error opening file: " << fileName << std::endl;
                continue;
            }      
            f->ls(); 
            f->GetObject("analysis", tree);
            std::cout<< "////////////////////////////////////////////"<<std::endl;
            std::cout << "Total entries in fChain: " << tree->GetEntries() << std::endl;

        }
    }
    Init(tree);
}


inclphoton::~inclphoton()
{
    if (!fChain) return;
    delete fChain->GetCurrentFile();
}

Int_t inclphoton::GetEntry(Long64_t entry)
{
    if (!fChain) return 0;
    return fChain->GetEntry(entry);
}

Long64_t inclphoton::LoadTree(Long64_t entry)
{
    if (!fChain) return -5;
    Long64_t centry = fChain->LoadTree(entry);
    if (centry < 0) return centry;
    if (fChain->GetTreeNumber() != fCurrent) {
        fCurrent = fChain->GetTreeNumber();
        Notify();
    }
    return centry;
}

void inclphoton::Init(TTree *tree)
{
    ttdata_presel_photonPt = 0;
    if (!tree) return;
    fChain = tree;
    fCurrent = -1;
    fChain->SetMakeClass(1);
    fChain->SetBranchAddress("ttdata_presel_photonPt", &ttdata_presel_photonPt, &b_ttdata_presel_photonPt);
    Notify();
}

Bool_t inclphoton::Notify()
{
    return kTRUE;
}

void inclphoton::Show(Long64_t entry)
{
    if (!fChain) return;
    fChain->Show(entry);
}

Int_t inclphoton::Cut(Long64_t entry)
{
    return 1;
}
#endif

I would appreciate any insights or suggestions on resolving these issues. Thank you!