attachments upload: something does something

import android.util.Log;

import androidx.annotation.Nullable;

import com.nextcloud.android.sso.aidl.NextcloudRequest;

import com.nextcloud.android.sso.helper.Okhttp3Helper;

import com.nextcloud.android.sso.helper.ReactivexHelper;

import com.nextcloud.android.sso.helper.Retrofit2Helper;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.OutputStream;

import java.io.Serializable;

import java.lang.annotation.Annotation;

import java.lang.reflect.Method;

import java.lang.reflect.ParameterizedType;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import androidx.annotation.Nullable;

import io.reactivex.Completable;

import io.reactivex.Observable;

import okhttp3.Headers;

import retrofit2.http.HTTP;

import retrofit2.http.Header;

import retrofit2.http.Multipart;

import retrofit2.http.OPTIONS;

import retrofit2.http.PATCH;

import retrofit2.http.POST;

import retrofit2.http.PUT;

import retrofit2.http.Part;

            return buffer.inputStream();

        }

        catch (final IOException e) {

            throw new RuntimeException("failed to build request-body");

            throw new RuntimeException("failed to build request-body", e);

        }

    }