[BUG]saving Smith chart

[sprakashb]

Smith chart : saving is shown but does not create it in memory.

[cho45]

Would you fill following?

Describe the bug
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To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots
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Environment (please complete the following information):

• Serial Interface [e.g. WebUSB/WebSerial/Capacitor]
• OS: [e.g. macOS 10.13 / Windows 10]
• Browser [e.g. Chrome 77.0.3865.90]
• Version [e.g. 1790f9f]

Additional context
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[ricknun]

I am using a Samsung Galaxy S8 phone with Android v9, One UI v1.0, and NanoVNA WebUSB Client v1.4. A USB cable and OTG cable connect to a DEEPELEC NanoVNA-F hardware v2.3 and firmware v0.2.1 by BH5HNU. Much is working well. When I am looking at a frequency plot in the app and execute "Save Freq Chart as .png" I can find "My Files/Documents/graph-yyyymmdd-hhmmss.png" with no problem. But when displaying a Smith Chart and I execute "Save Smith Chart As .png" I see a pop-up that says the file is being saved, but there is no corresponding file in "My Files/Documents".