I’m trying to handle files in bot framework in teams.

I have a dialog with this function :

async finalStep(stepContext) {
    if (stepContext.result && stepContext.result.length > 0) {
        stepContext.values.files = await Promise.all(stepContext.result.map(async file => ({
            filename: file.name,
            fileContent: await this.getFileContentInBase64(file.contentUrl)
        })));
    } else {
        stepContext.values.files = [];
    }

    const userProfile = await this.userState.get(stepContext.context, {});
    const aadObjectId = userProfile.aadObjectId;

    const finalData = {
        userId: aadObjectId,
        cet: stepContext.values.cet,
        sector: stepContext.values.sector,
        job: stepContext.values.job,
        requestType: stepContext.values.requestType,
        description: stepContext.values.description,
        files: []
    };


    const apiUrl = ''; // power automate url

    try {
        const response = await axios.post(apiUrl, finalData, {
            headers: {
                'Content-Type': 'application/json'
            }
        });
        const ticketId = response.data.id;

        await stepContext.context.sendActivity(t('dt_ticket.ticket_created', { ticketId }));

        const accessToken = await getAccessToken();
        const siteId = '';
        const driveId = '';
        const folderId = '';

        await this.uploadFilesToGraph(accessToken, siteId, driveId, folderId, stepContext.values.files, ticketId);

    } catch (error) {
        console.error('Error sending data to the API: ', error.response ? error.response.data : error.message);
    }

    return await stepContext.endDialog();
}



async getFileContentInBase64(contentUrl) {
    const response = await axios.get(contentUrl, { responseType: 'arraybuffer' });
    return Buffer.from(response.data, 'binary').toString('base64');
}

async uploadFilesToGraph(accessToken, siteId, driveId, folderId, files, ticketId) {
    try {
        const client = Client.init({
            authProvider: (done) => {
                done(null, accessToken);
            }
        });

        for (const file of files) {
            //const fileContent = Buffer.from(file.fileContent, 'base64');

            // Create a small file with random content
            const fileName = file.filename;
            const fileContent = 'This is a random test content: ' + Math.random();
            fs.writeFileSync(fileName, fileContent);
            const fileBuffer = fs.readFileSync(fileName);

            const fileUploadUrl = `/sites/${siteId}/drives/${driveId}/items/${folderId}:/${ticketId} - ${file.filename}:/content`;

            const response = await client.api(fileUploadUrl).put(fileBuffer);

        }
    } catch (error) {
        this.logDebug('Error uploading files to Graph', { error: error });
    }
}

I modify this to try to juste upload a little text file. On emulator localhost, it’s working well, but when I’m using this code through teams bot, I have the following error :

Error: DialogContextError

And I don’t have more informations.
The part which catch the error on index.js :

// Catch-all for errors.
adapter.onTurnError = async (context, error) => {
    console.error(`n [onTurnError] unhandled error: ${ error }`);

    // Log error to Application Insights
    telemetryMiddleware.telemetryClient.trackTrace({
        message: 'Error',
        properties: { error: error.toString() },
        severityLevel: 3 // Error
    });

    // Send a trace activity
    await context.sendTraceActivity(
        'OnTurnError Trace',
        `${ error }`,
        'https://www.botframework.com/schemas/error',
        'TurnError'
    );

    // Send a message to the user
    await context.sendActivity('The bot encountered an error or bug.');
    await context.sendActivity('To continue to run this bot, please fix the bot source code.');
    await context.sendActivity('Error : ' + error);
};

I can’t figure out where the issue is, if you have some thoughts, would be great.